Hardy Boys: Undercover Brothers Books in Order

Frank and Joe go undercover in Ocean Grove, New Jersey, to investigate jewelry robberies targeting tourists. With numerous suspects along the boardwalk, the brothers follow clues through dangers that reach beyond the crowded seaside attractions.

An international CD piracy network recruits teenagers, drawing Frank and Joe into an undercover investigation close to home. A classmate becomes an early suspect as the brothers search for the people exploiting young workers and stolen music.

Frank and Joe investigate a possible attack at Philadelphia's Big Air Games. With extreme athletes and spectators potentially at risk, the undercover brothers must determine whether the threat comes from one person or an organized group.

Frank and Joe go undercover at a camp for troubled teenagers near Maine's Moosehead Lake. Reports of deaths and injuries make the camp's founder a suspect as the brothers investigate what is happening to its residents.

Frank and Joe receive a mission to stop a threat against Niagara Falls. A string of smaller assignments follows, leaving the undercover brothers wondering whether their unusual workload hides a connection to something more dangerous.

Frank and Joe investigate possible oil-industry crimes from an isolated California community led by Arthur Stench. Their undercover assignment places innocent residents at risk as the brothers search for the truth behind the apparent utopia.

Frank and Joe investigate a woman's suspicious death at Uncle Bernie's Fun Park in Massachusetts. Strange incidents at the amusement park suggest further danger, forcing the undercover brothers to look beyond its cheerful attractions and visitors.

Frank and Joe have only eight hours to locate a bomb at Arizona's Billington Resort. A vintage car auction and celebrity wedding complicate their search as they race to identify the target before the deadline.

False hurricane warnings send Bayport residents fleeing, and burglaries follow their departures. Frank and Joe investigate whoever is exploiting the storm season, especially when the alarming forecasts appear to come from sources people normally trust.

Two students suffer injuries connected to the Rising Phoenix Martial Arts school in Holtsville, New Jersey. Frank and Joe investigate the incidents undercover, trying to establish what links them and whether more students face danger.

Frank and Joe travel to Cairo to investigate a murder tied to an expedition seeking a golden mummy. A mysterious map, suspicious expedition members and talk of a curse complicate the brothers' search for answers.

Frank and Joe work undercover as production assistants on a young pop star's music video in Los Angeles. Numbered death threats turn the assignment urgent as the brothers investigate who wants to harm the singer.

An ambassador's son disappears on St. John in the U.S. Virgin Islands, leaving local police with few clues. Frank and Joe undertake an undercover search to discover what happened to him and who is responsible.

A pirate-themed reality show on Bayport's waterfront suffers dangerous sabotage. Frank and Joe investigate threats to contestants and crew, with personal grudges and fierce competition supplying possible motives among the people working on the production.

Frank and Joe guard valuable diamonds at a Bayport fashion show, where model Naomi Dowd also faces danger. With millions of dollars in jewels at stake, the brothers investigate a case in which everyone could be a suspect.

Frank and Joe go undercover with Pinnacle College's leading football team to investigate suspected bribery. Someone may be planning to throw the championship game, and the quarterback, coach, and other team members all have possible motives.

Frank and Joe investigate a student's death and reports of hazing at Eagle River Academy. Going undercover as new students puts them among potential targets while they question seniors, a dorm monitor, and the dead student's girlfriend.

Threats against Eastside Mall appear to come from an environmental group defending nearby wetlands. Frank and Joe must determine whether the group is responsible while protecting friends who work and spend time at the mall.

Runaway teenager Evan Davis is killed after being pushed from a subway platform. Frank and Joe investigate connections to a youth shelter, where residents and Evan's politically ambitious father may be concealing important information.

Frank and Joe attend a San Francisco comics convention to uncover forged original artwork. Rival artists, fans, and a gallery owner fall under suspicion, while the investigation threatens to put the crowded convention in danger.

Frank and Joe join a reality show whose teenage contestants surrender modern comforts to compete for a million dollars. Death threats against participants turn the Beverly Hills villa into an undercover assignment with everyone under suspicion.

Working inside movie star Justin Carraway's entourage, Frank and Joe investigate a paparazzo's murder in Atlantic City. Strange incidents continue, leaving them unsure who to trust before the killer selects another victim close to the celebrity.

Frank and Joe investigate the stalking of a teenage screen star. The discovery that he has a twin brother complicates their assignment, turning a seemingly straightforward protection case into a mystery involving the brothers' relationship.

A mysterious death occurs during qualifying rounds for a hot dog eating competition. Frank and Joe follow the case from Miami toward the Super Bowl final, where contestants may have deadly reasons to eliminate their rivals.

Frank and Joe remain undercover on Deprivation House after the first culprit is caught. Continued accidents suggest another threat inside the Beverly Hills villa, and they must protect contestants and crew before someone else dies.

With Deprivation House stripped of its comforts, every remaining contestant faces deadly danger. Frank and Joe must uncover who is behind the continuing scares, considering both new arrivals and participants who may have hidden secrets.

Ryan Carraway disappears while his movie star brother Justin films in Bayport. Frank and Joe search for him in New York, where Justin's increasingly strange behavior raises the possibility that he knows more than he admits.

Galaxy X is preparing to open, but threatening emails and repeated accidents endanger the new theme park. Frank and Joe investigate the sabotage, trying to identify who wants the California attraction closed before anyone is seriously hurt.

Frank and Joe investigate Bret Johnston's death as Galaxy X prepares for its grand opening. Celebrities attending the event could be next, and enemies from the owner's present or past may be responsible for the danger.

Frank and Joe follow professional skater Cody Zane during Galaxy X's grand opening. Someone appears determined to destroy his rising career, adding a targeted threat to the dangers already surrounding the new theme park.

Frank and Joe pose as extras on Deathstalker to investigate threats against its star, Anya. An attempt to burn her trailer makes the danger concrete, and the brothers must uncover who is disrupting the movie.

Anya continues receiving threatening messages while Frank and Joe work undercover on Deathstalker. Keeping her safe at a comic convention is only part of their task, as the ongoing attacks threaten to stop the movie's production.

Deathstalker begins filming, but the threats against actress Anya continue despite Frank and Joe's protection. Working undercover as extras, the brothers must identify the person behind the attacks before the movie suffers another dangerous disruption.