A dying criminal confesses that his loot has been stored "in the tower." Both towers of the looted mansion are searched in vain. It remains for the Hardy boys to make an astonishing discovery that clears up the mystery and clears the name of a friend?s father.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.

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

When the Hardy boys eagerly agree to assist their friend Jack Dodd and his father in locating a family treasure, the two young detectives are unaware of the baffling complications that will arise. The only clue to the long-lost treasure is a cryptic message written by a Pilgrim ancestor. But when Mr. Dodd and Jack are accused of stealing cars and then mysteriously disappear, Frank and Joe are confronted with a triple mystery. Have their friends run...

Frank and Joe travel to New Jersey where they investigate a series of robberies at jewelry stores. In Boardwalk Bust, Frank and Joe head to Ocean Grove, New Jersey, to investigate a rash of jewelry store robberies. The temperature's sizzling; will the boys be able to smoke out 'sticky fingers' before they're burned? Mission: Investigate and put a halt to the recent rash of jewelry store robberies. Potential danger on the ground and in the air. Location:...

Frank and Joe investigate a string of false hurricane warnings and subsequent burglaries in Bayport.

Frank and Joe try to solve a murder in Egypt possibly committed over a map to a precious golden mummy.