As Frank and Joe investigate the mysterious disappearance of a college professor, they stumble upon a baffling secret in a complex network of caves.
ISBN: 9780807216811Unabridged Download
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.
ISBN: 9780807215890Unabridged Download
Timber Wolves, a Rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the principal members of a notorious gang responsible for a payroll robbery.
ISBN: 9780807215548Unabridged Download
When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hideout on an island along the way.
ISBN: 9780807207772Unabridged Download
The Hardy Boys are determined to learn the secret of the old mill, but once trapped in it, they discover two mysteries to investigate.
ISBN: 9780807207741Unabridged Download
When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.
ISBN: 9780807207710Unabridged Download
After a dying criminal confesses that his loot has been stashed "in the tower," the Hardy boys make an astonishing discovery.
ISBN: 9780807207680Unabridged Download