The Hardy brothers embark on a freighter trip under mysterious circumstances and find themselves involved with a smuggling ring.[...]
When a crime syndicate takes over Bayport's reservoir Frank and Joe Hardy help their detective father solve the sinister mystery[...]
The Hardy boys find the missing deed to an Indians' land, prevent a phony salesman from carrying through a reckless scheme, and help their father solve a top-secret case.[...]
When their peregrine falcon brings down a homing pigeon carrying rubies, the Hardy brothers find themselves involved with kidnappers.[...]
Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.[...]
Frank and Joe Hardy tackle native voodoo, a dangerous gang of criminals, and a mysterious ghost when they set out to search for their father in the Caribbean islands[...]
Frank and Joe Hardy meet many adventures while trying to recover a valuable stolen artifact in the Northwest Territories[...]
Frank and Joe Hardy struggle to locate two stolen paintings that contain clues to hidden treasure
Frank and Joe pose as construction workers in order to track down the saboteurs of a road-building project in Kentucky[...]