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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.

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.

A Japanese business tycoon mysteriously disappears and, soon after, a rare samurai sword is stolen from an art gallery.

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.