Gertrude Chandler Warner Books in Order

The Aldens join Grandfather for a three-day bicycle race with overnight camping. Misleading road signs, collapsing tents and Henry's repeated flat tires make the children wonder whether someone is deliberately interfering with the event.

Jessie joins a girls' hockey team coached by the children's favorite star, Kevin Reynolds. As plans develop for a new rink in Greenfield, missing equipment and damaged blueprints lead the Aldens to suspect sabotage.

Visiting a ballpark in Pikesville, the Aldens wonder why one team keeps hitting so many home runs. Violet's sighting of lights in an abandoned factory adds another puzzle to their investigation of possible cheating.

The Aldens make their annual trip to Sherman Farm for honey, but the bees are in trouble and supplies are low. With the farm's business threatened, the children look for clues to the problem.

Mrs. McGregor's sister may have to sell their childhood home, now a bed-and-breakfast called the Crooked House. The Aldens investigate a riddle and rumors of hidden treasure, hoping to help save the property.

A rainy day spent playing Ringmaster leads to an invitation to test its unreleased sequel. The Aldens become suspicious when characters in the computer game mention real people and places from their hometown of Greenfield.

The Aldens start a party-planning business in Greenfield, but a safe is emptied during an event. When another theft occurs at a birthday party, the children investigate whether their celebrations are attracting the same thief.

Vacationing on North Carolina's Outer Banks, the Aldens promise Grandfather a break from mysteries. Benny's sighting of a stallion on the beach draws them toward a local ghost-horse legend and the area's wild ponies.

The Aldens visit a zoo where their friend Lindsey works and learn that two rare ferrets have been stolen. When California condors also disappear, the children investigate whether someone with access to the animals is responsible.

Benny's Saturday starts badly when he can't buy a poster and encounters his teacher outside the supermarket. Hoping the day will improve, he heads toward a new snack shop and an unexpected surprise.

While visiting Aunt Jane, the Aldens investigate strange incidents at the Wagner Farmhouse museum. Signs disappear and other disruptions suggest sabotage, but stories about a former owner's mischievous ghost complicate the children's search for answers.

Helping a volunteer group repair the Bugbee Mansion, the Aldens discover hidden rooms and hear odd noises inside its walls. A secret staircase adds to the puzzle as they investigate a thief's connection to the house.

Grandfather's college reunion brings the Aldens to Goldwin University, where a clock tower has a mysterious reputation. The children investigate stories about its past and a valuable object said to be hidden at the school.

In Elbow Bend, Alabama, the Aldens hear a legend about a ghostly dog whose midnight howls warn of danger. When local dogs begin howling together, the children investigate whether the frightening story explains what's happening.

The Aldens visit Broken Moon Pond, a vacation spot Grandfather remembers from childhood. Strange mishaps interrupt their stay, and the sight of an empty boat apparently rowing itself gives the children another mystery to investigate.

At the mansion of Grandfather's former college roommate, the Aldens explore a collection of carnival rides, toys and gadgets. Unexplained music, moving furniture and machines switching on by themselves make the house seem haunted.

Benny wants to dig a hole in the backyard, and Grandfather gives him an old map. What begins as a plan to dig turns into a search for a secret waiting beneath a tree.

The Aldens look forward to camp activities and an Olympic competition with new friends. Missing luggage, a vanished flag and another team's suspicious use of Jessie's ideas make them wonder whether somebody is cheating.

Benny's friend Tyler brings his two-year-old brother Sam along to play. Benny expects no trouble, but Sam disrupts their puzzle and then disappears, leaving the older boys with a much bigger problem to solve.

The Aldens help at Mrs. Winkles's candy factory when she needs extra workers. Broken machinery, departing employees and threatening messages on candy hearts make the children suspect that someone is trying to ruin her business.

The Aldens help fix up a mansion bought by Grandfather's friend, whose previous owner studied bones. Skeletons inside the house, rumors of them walking and missing valuable statues give the children a puzzling investigation.

The Aldens visit a Louisiana bayou where missing food and mysterious signs suggest something strange is happening. Benny spots an alligator, and rumors about the ghost of Gator Ann give the children another puzzle to investigate.

The Aldens help prepare an Egyptian exhibit at the Greenfield Museum. When a four-thousand-year-old mummy arrives and disasters follow, the children investigate whether an ancient curse is responsible or someone has a more ordinary explanation.

An eccentric millionaire offers a prize to whoever solves his riddles first. When their friend Sam receives a puzzling letter, the Aldens help follow its clues and work out who might claim the promised money.

The Aldens enter a gemstone competition at Ruby Hollow Gem Mine, where Jessie finds a ruby. When her discovery disappears before she can submit it, the children search for the person who took their promising entry.

The Aldens join a camping trip on Blizzard Mountain, where stories of buried treasure add excitement. Missing supplies, strange noises and a missing group member turn their outdoor adventure into a mystery they need to solve.

A visit to Vermont brings the Aldens to the annual Bear Jamboree, where stuffed bears are the main attraction. When a rare bear disappears, the children look for clues among the toys and festivities to catch a thief.

Benny plans to enter a pet parade costume contest with Watch and dresses as a detective. When his dog ruins the costume just before the parade, Benny must quickly find another way to join the fun.

A handwritten riddle tucked inside Benny's fortune cookie sends the Aldens searching for clues. More cookies lead them along a puzzling trail, and the children try to discover who arranged the challenge and what it means.

The Aldens' new neighbors stay behind a high wall decorated with enormous black spiders. Benny suspects they are keeping a secret, and the children investigate the strange household to find out what is really going on.

The Aldens examine a rare Captain Fantastic comic book and find a suspicious note connected to its creator's signature. When the comic disappears, the children must untangle the clues and find out who wanted it gone.

The Aldens visit a Florida aquarium, where they help feed penguins and swim with dolphins. A great white shark attracts crowds, but someone wants it removed, giving the children a mystery amid their encounters with sea creatures.

The Aldens help at Greenfield's Ice Cream Barn and learn about making different flavors. Trouble at the shop suggests someone wants it closed, so the children investigate who is threatening a business they have come to enjoy.

The Aldens attend an invention convention at a famous inventor's home, surrounded by unusual clocks. Mysterious tapping at midnight interrupts the gathering, leaving the children to investigate strange sounds while inventors compete to show their creations.

Benny finds a handwritten riddle in a fortune cookie, and the Aldens follow its clues. A trail of further cookies keeps them guessing as they try to discover who created the puzzle and where it leads.

The Aldens take part in a live mystery broadcast at an AM radio station. When a supposed ghost disrupts the show and frightens listeners away, the children investigate who or what is interfering with the production.

A Greenfield art contest draws the Aldens into a mystery involving paintings at a gallery. A troubling note suggests that artwork may have been stolen or replaced with a fake, and the children investigate the warning.

Benny gets permission to invite Michael and Tyler for a sleepover in the backyard boxcar. Their excitement turns to nervousness when talk of being scared, a walk in the dark and a loud crash test their courage.

Benny and Watch find a set of lost keys at the library. With only a few clues to guide them, they search around Greenfield for the owner, turning a small discovery into a mystery to solve.

The Aldens visit an Iowa farm during the Corn King Days festival. When someone damages the corn maze at night, the children investigate the vandalism before the trouble forces a favorite festival attraction to shut down.

The Aldens help their neighbor Lina search her attic for a treasure she believes is hidden there. Other people are looking too, turning the hunt into a race to discover what the house may contain.

Benny notices a strange light in the old boxcar the Aldens use as a backyard playhouse. The children investigate clues connected with its past as they try to explain whether their familiar refuge could be haunted.

The Aldens visit Fran in Wisconsin, where an old family ghost seems to have returned. A bell clangs after dark, and Violet hears ringing at night, prompting the children to investigate the strange disturbances around them.

The Aldens help Libby at Game Spot, a new shop in Crossroads Mall. Robberies at other stores and letters disappearing from a sign give the children clues to a mystery that threatens the fun of the opening.

Norah Eton believes valuable jewelry is hidden somewhere at Eton Place, and the Aldens come to help find it. Their search becomes more complicated when reports of a ghost add another mystery to the old property.

The Aldens visit an old Kansas inn with puzzling connections to two former guests. A photographer's single picture and a young stranger who arrived on an orphan train leave the children with secrets to investigate.

The Aldens volunteer at a medieval fair, where Benny serves as a page to the Silver Knight. When a valuable antique sword disappears, they investigate the performers before the fair leaves town with the mystery unsolved.

The Aldens visit Amy's lakeside retreat in Canada, where tourists hope to glimpse the legendary Ogopogo. A riddle may lead to treasure that could save her business, but strange happenings threaten the children's search for it.

The Aldens help a friend of Grandfather's build a giant yo-yo to break a world record. Missing plans and someone following them suggest sabotage, so the children investigate who wants to stop the project before its launch.

The Aldens help Greenfield's popular band prepare for a music festival that could catch a producer's attention. When the instruments disappear the day before the show, the children investigate the theft before the performance is ruined.

Mystery writer Gilbert Finch is due to speak at Greenfield's library, but he fails to appear at the train station. The Aldens investigate his disappearance before a rival author takes his place at the event.

Watch discovers a box containing a note that introduces the Aldens to geocaching. They join a club and search Greenfield for hidden boxes, but a suspected thief turns their new treasure-hunting hobby into a mystery.

The Aldens visit Aunt Jane in Elmford and attend rehearsals at the Trap-Door Theater. Strange events center on the seat once occupied by its benefactor, leaving the children to investigate whether a ghost is disrupting the show.

On vacation in Seattle, Benny discovers a riddle under a diner table. The Aldens follow a chain of puzzles through the city, trying to work out who planted the clues and where the final answer will lead.

The Aldens find an old Hopi mask while preparing for a yard sale and plan to return it to its rightful owners. When it is stolen, they must recover it before the weekend's intertribal gathering.

The Aldens spend a week helping at a rescue ranch, where Jessie grows fond of a horse named Dragon. When horses disappear from the pasture, the children investigate what is happening to the animals in its care.

The Aldens visit a friend's drive-in theater and enjoy movies under the stars. Disruptive pranks, employees keeping secrets and a ghost seen on the empty grounds leave the children investigating what is troubling the old theater.

The Aldens enter a radio station's detective contest, hoping to win a gift for Mrs. MacGregor. Riddles lead them across Greenfield, but false clues suggest another contestant is trying to keep them from reaching the prize.

The Aldens help a local restaurant owner tend a garden, watering and weeding the growing food. When plants seem to change positions, the children investigate why their carefully tended vegetables are moving around without explanation.

The Aldens enter Watch in a contest that could bring their dog fame and fortune. Repeated mishaps threaten his chances, and the children investigate the trouble while trying to keep their canine contestant in the running.

This collection brings together three Alden mysteries involving dogs. The children investigate trouble at a dog show, a break-in at a guide dog school and a North Carolina legend about a ghost dog that howls at midnight.

The Aldens enroll Watch in a new dog obedience class, but another owner's Dalmatian disappears. When a second dog goes missing, they investigate the instructor and other customers to discover whether someone is stealing the pets.

An old wedding photograph and a riddle draw the Aldens into a neighbor's elaborate spy game. As they follow clues toward hidden treasure, puzzling connections make them question who devised the game and what lies behind it.

After meeting vampire novelist Mr. Hudson, the Aldens hear rumors of a real vampire haunting the cemetery behind his home. They investigate the frightening sightings, suspecting someone has revived the legend to scare people away.

The Aldens compete in a televised clue hunt around Philadelphia while a camera crew records their progress. Wrong directions and suspicious interference threaten their chances, turning the game into an investigation of who wants their team to fail.

Mama Tova's cupcakes draw long lines in Greenfield, but a break-in puts her secret recipe at risk. The Aldens follow the evidence to a cupcake contest, hoping to identify the thief before the recipe is lost.

The Aldens visit a New England farm known for pumpkins and hayrides. A figure with a glowing pumpkin head begins warning visitors away, threatening the autumn festivities and giving the children a frightening mystery to investigate.

Helping at Cogwheel Stadium during the Clayton Cogs' pennant race, the Aldens notice opposing batters seem to know each pitch. They search for someone stealing the pitcher's signals before the spying costs the home team its chance.

A spring visit to the zoo brings the Aldens into a children's photography contest with a cash prize. When a camera disappears, they must investigate the missing equipment amid the excitement over newborn animals and the competition.

The Aldens enjoy volunteering at Greenfield's recycling center and restoring useful objects found there. Break-ins and vandalism disrupt the work, leading them to investigate why someone would deliberately damage a place devoted to rescuing discarded things.

The Aldens help a food pantry prepare a free Thanksgiving dinner for Greenfield. Moved signs are troubling enough, but when the turkey disappears, they must find the culprit before the town's holiday meal is ruined.

At Winding River Lodge, the Aldens hear tales of a zombie haunting the nearby woods. As disturbing evidence appears, they enlist a reporter and local residents to determine whether the legend conceals a very different explanation.

The Aldens tend Mr. Yee's vegetable plot while his broken arm heals. Missing produce and damaged plots reveal trouble across the community garden, and the children investigate who is undermining the gardeners' hard work.

Visiting the New Jersey shore, the Aldens help a family friend at a newly purchased amusement pier. Rumors about unsafe rides and a missing haunted-house figure make them suspect someone is trying to spoil the business.

While training Watch as a search-and-rescue dog in Oregon, the Aldens discover a backpack filled with jewelry that fell from a plane. Trying to return the valuables draws them further into questions about the strange discovery.

A shortcut through Greenfield Cemetery introduces the Aldens to a superstition about leaving gifts for a ghost. They investigate who benefits from the tradition and whether threats of bad luck are being used to frighten visitors.

At Grandfather's old university, the Aldens hear that rooftop gargoyles will defend a library scheduled for demolition. When the stone creatures appear in unexpected places, they seek the explanation behind sightings that are terrifying the campus.

Jessie's teammate Kayla earns a chance to become a mascot at a soccer tournament in Brazil. An anonymous letter challenges her right to go, and the Aldens investigate who is trying to damage her reputation.

The Aldens visit a mountain town for a snowboarding competition and look forward to winter sports. A stolen snowboard involving a star athlete interrupts the fun, drawing them into an investigation amid tensions over the town's future.

The Aldens visit Wildcat Crossing, a recreated frontier town with a Wild West show. Disappearing horses and disruptive pranks threaten the performances, so the children search for the person turning the cowboy attraction into a troubled operation.

A vacation at the Calgary Stampede gives the Aldens parades, performances, and a taste of Canada's cowboy traditions. When an important piece of jewelry disappears, they investigate the theft before it disrupts the festival's big show.

Violet hopes to meet pop star Madlynn Rose at a television talent-show audition in Silver City Mall. When the celebrity vanishes before the event begins, the Aldens search for clues to her disappearance among the crowds.

At a dinosaur excavation in Montana, the Aldens discover that rare bones have gone missing. Strange sounds in nearby caves and unexplained tracks deepen the mystery, leaving them to investigate both the thefts and rumors of a living dinosaur.

The Aldens visit Sleepy Hollow, where a friend's ghost-tour business is threatened by a strange rider throwing frightening pumpkins. With the famous headless horseman legend looming over the town, they investigate who is behind the attacks.

The Aldens volunteer to restore an abandoned school in Silver City as an arts center. Doors lock unexpectedly and mysterious chalkboard messages appear, frightening other helpers and prompting the children to uncover what is disrupting the project.

The Aldens meet Walter, a cat famous for internet videos who has inherited a million dollars. As belongings vanish from his house, they investigate whether anger over the owner's will has made the celebrity pet a target.

The Aldens help Cousin Alice run for mayor, but campaign posters for her and her opponent are vandalized. A third candidate's posters then appear, although nobody has met him, giving the children an election mystery to unravel.

Staying at a castle hotel in Ireland, the Aldens encounter a superstitious caretaker and a nighttime figure carrying a lantern. Rumors of a banshee raise the stakes as they investigate the secret hidden within the old building.

A painted turtle figurine introduces the Aldens to a secret society that returns displaced treasures to their origins. Traveling by private train to New Mexico, they encounter opponents determined to interfere with their first mission.

Arriving in Egypt, the Aldens discover their secret society contact has disappeared. A puzzle in a papyrus scroll guides their next delivery, but thieves and rival collectors threaten their mission to return treasured objects to their proper homes.

The Aldens' artifact-returning mission takes them to China's Great Wall and an elephant reserve in Thailand. A thief threatens their cargo, while suspicious behavior from a contact makes it harder to know whom they can trust.

On the final stage of their journey, the Aldens follow misleading clues across Argentina before preparing to return a rare orchid to Machu Picchu. Persistent rivals threaten the fragile cargo and the completion of their worldwide mission.

The Aldens seek the owner of a rare coin in Sydney before traveling to Antarctica to return an expedition artifact. A determined saboteur follows their progress, threatening the secret society's mission across two very different landscapes.

The Aldens investigate strange happenings at a haunted hotel, with readers choosing how the mystery unfolds. Decisions about where to go and what to examine lead the children through different rooms and possible paths toward solving it.

Visiting friends for a Day of the Dead celebration, the Aldens enjoy learning about the holiday and helping with preparations. Mysterious disruptions threaten the event, and they must discover what is happening before the festivities are spoiled.

The Aldens help at a Greenfield doughnut shop as a new competitor opens across town. When the rival's products resemble familiar favorites, they investigate whether coincidence or stolen recipes explains the unsettling similarities between the businesses.

The Aldens visit a town preparing for its harvest festival, but rumors about a werewolf and the harvest moon frighten visitors away. They investigate the source of the legend before fear overwhelms the autumn celebration.

Henry and Jessie's robotics team prepares for an important competition, then its robot is stolen. The Aldens combine their knowledge of technology with detective work to find the culprit and protect the team's chance to compete.

An apartment building owner in Silver City believes in black cats, broken mirrors, and unlucky numbers. Strange events on the thirteenth floor make the Aldens investigate whether superstition or someone's actions explain the trouble in the building.

The Aldens enter a spy competition where their choices could lead to victory or expose their cover. Readers decide what the children do next, following different paths through an interactive mystery filled with espionage challenges.