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Falsely accused of a robbery at the airport, the Hardy boys turn the tables on the real thieves by nabbing them in the act of committing another robbery.

When their friend Jack Dodd and his father are accused of car theft and disappear mysteriously soon after, Frank and Joe, who agreed to help them search for a family treasure, find themselves searching for the father and son instead.

On an ice-bound, snow-covered island, Frank and Joe attempt to solve the mystery of a boy's disappearance and the theft of a priceless collection of antique medals.

An archaeological expedition in the West turns into a desperate attempt to capture robbers and an escaped convict.

The Hardy boys' search for stolen gold leads them to an abandoned mine where, in the depths of the earth, they are attacked by outlaws.

After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.

Who is writing threatening notes? How could anyone get into the secret room of the old mansion? As Frank and Joe investigate, robbery and mistaken identity complicate matters.

Frank and Joe Hardy become involved in a large and dangerous conspiracy while trying to keep the valuable invention created by one of their father's clients from falling into the hands of thieves.

While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.

A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

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