Hardy boys undercover brothers

Young detectives Joe and Frank Hardy investigate sabotage on the set of a reality show.

Frank and Joe Hardy investigate an illegal international CD-burning operation that employs teens. They search for the mastermind behind the operation by starting with their classmate Julian Sanders.

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 investigate a woman's death and other mysterious events surrounding Uncle Bernie's Fun Park.

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, 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.

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 try to stop someone from destroying Niagara Falls.

Frank and Joe Hardy, agents of the top secret American Teens Against Crime organization, cannot believe their luck when they are sent to a local diamond show and assigned to guard supermodels--who just may be diamond thieves.

Presents the first four novels in the "Hardy Boys: Undercover Brothers" series, in which Frank and Joe Hardy work as undercover agents for the American Teens Against Crime organization.