Teenage detectives Frank and Joe Hardy investigate a supposedly haunted house reported to be the hangout of criminals

A plot to steal a top-secret instrument vital to the United States space program poses a challenging case for Frank and Joe Hardy. After rescuing a South American stowaway who mutters a warning about “Footprints “ and then vanishes, Frank and Joe discover that documents belonging to their famous detective father are missing and that footprints linger under a window. The young detective’s search for the diabolical mastermind of the...

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

The Hardy boys' search for stolen gold leads them to an abandoned mine where, in the depths of the earth, they are attacked by outlaws.

"Frank and Joe Hardy are assigned to pose as extras on the set of the an upcoming teen movie, Deathstalker. The star, an ingenue named Anya, believes that someone is out to get her--and she's got proof. Someone tried to burn down her trailer! The Undercover Brothers need to get to the bottom of the arson, and other mayhem surrounding the filming of the hit comic book"--From publisher description.

Frank and Joe Hardy investigate a mysterious death at the qualifying rounds of a hot dog eating contest.

The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before