In 'The Missing Mitt,' the boys must help their teammate find his lucky mitt before the last game...

In a search for the missing Willard Grafton, Frank Hardy and younger brother Joe, encounter a gan...

In a series of hair-raising adventures both on land and undersea the teenage brother detectives p...

The handwritten will of a deceased world-traveler is strange and mysterious. Its cryptic instruct...

The famous young detectives Frank and Joe Hardy are caught up in a dangerous web of intrigue when...

When thieves hijack a collection of stuffed animals from a country auction, Frank and Joe Hardy p...

Caught in their motorboat the Sleuth by a sudden storm at sea, Frank and Joe Hardy are relieved t...

Why is a wealthy sportsman so frightened by the serpent design on a mysterious balloon that he be...

There is a crisis in Bayport! Soon the city will be without water! Every night, water strangely d...

Private investigator Fenton Hardy enlists the aid of his teenage detective sons in a search for a...

With two cases in tow, the Hardy boys look to Turner mill for clues. Determined to learn the secr...

Frank and Joe Hardy become involved in a case affecting national security when Joe dials a wrong ...