Frank and Joe go undercover as apprentice stuntmen on a major movie.

A student exchange program brings Frank and Joe to sun-kissed Greece. But the moment they hit the scenic port of Piraeus, they land in deep trouble. What starts as a street fight soon escalates to a hornet's nest of espionage, kidnapping, and diplomatic double cross.

Beautiful, rich, and spoiled Tessa invites Frank and Joe to look at her priceless treasure, the Borgia dagger. Fearing the curse on the dagger, Tessa asks the brother detectives to protect her.

Frank and Joe are investigating a series of gangland killings. They find themselves in a race to save their father, a former detective with the New York Police Department.

Frank goes undercover as a helicopter pilot and Joe goes undercover as a jack-of-all-trades to find out who is trying to destroy a floating oil rig in the Gulf of Mexico.

Frank and Joe meet their long-lost brother, Chris Hardy. But a hail of bullets cuts their visit short.

Frank and Joe go undercover as big-city bicycle messengers to crack a gang of high-tech thieves.

The Hardys are sailing a friend's yacht to the coast of Florida when a 5,000-ton cargo ship appears out of nowhere and nearly sends the yacht to the bottom. When the boys investigate they discover that the ship's crew is missing.

Frank and Joe take on the case of Denny Payson, a friend who suspects that his father was murdered in a chemical plant fire five years ago.

The Hardys are on the trail of their father's killer. They have uncovered a new piece of shocking evidence which indicates their father may still be alive. The problem is, there is no one the boys can trust, not even the police. They will have to penetrate Phoenix Enterprises alone.