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

In trying to trace a missing will, detectives Frank and Joe Hardy trap a dangerous criminal who is willing to risk all--including murder--for money.

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.

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.