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.

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...

A blind peddler?s warning and a weird glass eye plunge Frank and Joe Hardy into one of the most baffling cases they have ever tackled. The young detectives? investigation takes them to a walled estate guarded by savage dogs, where a wealthy businessman is hiding out in fear for his life. In a climax that will hold the reader spellbound with suspense, Frank and Joe find themselves trapped in a sinister house of mystery where there seems to be no escape!...

The Hardy brothers interrupt their investigations of jewelry-store holdups to answer a plea from their cousin on a New Mexico cattle ranch.

Difficult assignments are nothing new to the Hardy boys and this one that takes them to the Deep South is particularly challenging. Their mission: to vindicate a long-dead Confederate general, disgraced during the Civil War because he was accused of stealing hidden gold belonging to a bank. Skillfully avoiding booby traps and flying bullets, the boys persevere in their perilous quest.

On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.

While Frank and Joe help their father locate a notorious jewel thief, they also explore the mysterious death of a tycoon's nephew years before.