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Joe and Frank Hardy, undercover agents for ATAC--American Teens Against Crime--travel to Ocean Grove, New Jersey, on an assignment to figure out who is responsible for a rash of jewelry store robberies in the tourist town.

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

Frank and Joe travel to California where they investigate a utopian community to see if they intend to sabotage the oil industry.

Frank and Joe Hardy are undercover agents for the American Teens Against Crime organization and are assigned to investigate the sabotaging of an extreme sports meet in Philadelphia.

The Hardy boys take on an international illegal CD-burning operation, starting their investigation close to home: their first suspect is their classmate, Julian Sanders.

Joe and Frank Hardy, agents of American Teens Against Crime, uncover a wealth of secrets when they set out to find Kathy Boutry, a college reporter who was about to blow the whistle on several criminals.

Joe and Frank Hardy investigate the plot to destroy Niagara Falls and must locate the culprit before any damage can be done.

Frank and Joe travel to Massachusetts where they investigate a death and other mysterious events occurring at an amusement park.

Joe and Frank are summoned to investigate the rash of injuries and deaths that have occurred at a camp for troubled teens at Moosehead Lake in Maine.