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.
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.
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.
Frank and Joe's investigation of the theft of valuable antique weathervanes and their father's search for a missing Navy employee and top secret documents intertwine.
A Japanese business tycoon mysteriously disappears and, soon after, a rare Samurai sword is stolen from an art gallery. Suspecting a connection, the Hardy boys try to solve the mystery.
Joe and Frank Hardy travel to Egypt to investigate the theft of five priceless Egyptian statuettes stolen from a New York museum and are asked to guard a mysterious mummy en route.
