Calendar Mysteries Books in Order

An unsigned Valentine leads Bradley's class to a rabbit hidden in a closet. When Douglas becomes ill, Bradley, Brian, Lucy, and Nate search for the animal's owner and try to discover what is making him sick.

Strange lights and three-toed tracks convince Bradley that aliens have come to Green Lawn. When Dink, Josh, and Ruth Rose disappear, he and Brian, Lucy, and Nate investigate whether extraterrestrial visitors are responsible for the missing children.

Bradley, Brian, Lucy, and Nate join a springtime Easter egg hunt in Green Lawn. As they search, they realize some eggs have disappeared rather than simply been hidden, prompting an investigation into who is taking them.

Bradley, Brian, Nate, and Lucy decorate a leprechaun statue for Green Lawn's St. Patrick's Day contest. When it disappears overnight and other statues vanish too, the four friends investigate who is behind the thefts around town.

Bradley, Brian, Nate, and Lucy plan to make strawberry jam for Father's Day, but something keeps eating the berries. They investigate suspects ranging from pets to Josh, hoping to protect the patch and finish their homemade gifts.

After a Mother's Day hypnotist show, Bradley and Brian's mother starts behaving like a duck. With help from Lucy and Nate, the twins investigate whether she remains hypnotized and how to get their familiar mother back.

Bradley, Brian, Nate, and Lucy help a struggling traveling circus prepare its show in Green Lawn. A mysterious masked acrobat could save the performance, but the children must discover who the talented, elusive person is.

A Fourth of July pet costume contest offers its winner the chance to be mayor for a day. After dressing Polly and Pal, Bradley, Brian, Nate, and Lucy discover both animals are missing before the parade.

Bradley, Brian, Nate, and Lucy visit a hotel transformed into a Halloween haunted house, complete with an ogre. When children who enter fail to come back out, the friends investigate what is happening inside the attraction.

After caring for the class hamster all summer, Bradley, Brian, Nate, and Lucy find Goldi missing on the first school day. A sneaker key chain and other disappearances lead them to investigate a thief around Green Lawn.

Bradley, Brian, Nate, and Lucy find a lost puppy on Christmas Eve with a torn gift tag attached to its ribbon. They search for whoever bought the dog and the person meant to receive the present.

Bradley, Brian, Nate, and Lucy look forward to celebrating New Year's Eve together. Mysterious clues begin appearing before the party, leading the four friends to investigate whether something unexpected is planned beyond the usual confetti and noisemakers.

A couple moves next door to the Pinto twins and builds a tall fence around a guarded tent. Bradley, Brian, Nate, and Lucy investigate strange purchases and the neighbors' secretive behavior to discover what they are hiding.