Dixon, Franklin W

Frank and Joe Hardy travel to Philadelphia with friends to see Aerocirque, an exciting new circus act performed from helicopters, and become involved investigating a series of robberies in high-rise apartments.

The Hardy boys investigate strange happenings on Barmet Bay while acting with their friend Chet in a student film.

Frank and Joe Hardy are asked by Chet and Iola Morton to investigate the strange happenings on the Morton's grandparent's farm, but the boys worry that they may not find out who's behind the trouble in time to save the farm.

The Hardy boys investigate when someone tries to prevent a castle in southern France from being converted into a shelter for refugee children.

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.

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.

The Hardy boys' investigation of a museum robbery in England arouses the anger of a coven of black witches.

When Frank and Joe investigate threatening notes and a secret room in an old mansion, robbery and mistaken identity complicate matters.

When their SOS is ignored in a storm, the Hardy boys find a wallet containing two thousand dollars alongside their boat and are launched into a mystery involving diverse clues.

During their father's investigation of a ruthless gang of terrorists, the two young detectives face several adversaries.