Franklin W. Dixon

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

Read by Bill Irwin
approx. 3 hours
2 cassettes
Determined to learn the secret of the old mill, Frank and Joe employ a clever use to gain entrance and become trapped. There they unravel two mysteries, one involving a counterfeiting case and the other, a national security case their father is working on.

Frank and Joe go undercover at a major skateboarding contest in Venice, California, to try to find out who is killing off the competition.