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The HARDY BOYS Mystery Stories
BY FRANKLIN W. DIXON
| The Tower Treasure | The Mystery of the Flying Express |
| The House on the Cliff | The Clue of the Broken Blade |
| The Secret of the Old Mill | The Flickering Torch Mystery |
| The Missing Chums | The Melted Coins |
| Hunting for Hidden Gold | The Short-Wave Mystery |
| The Shore Road Mystery | The Secret Panel |
| The Secret of the Caves | The Phantom Freighter |
| The Mystery of Cabin Island | The Secret of Skull Mountain |
| The Great Airport Mystery | The Sign of the Crooked Arrow |
| What Happened at Midnight | The Secret of the Lost Tunnel |
| While the Clock Ticked | The Wailing Siren Mystery |
| Footprints under the Window | The Secret of Wildcat Swamp |
| The Mark on the Door | The Crisscross Shadow |
| The Hidden Harbor Mystery | The Yellow Feather Mystery |
| The Sinister Sign Post | The Hooded Hawk Mystery |
| A Figure in Hiding | The Clue in the Embers |
| The Secret Warning | The Secret of Pirates' Hill |
| The Twisted Claw | The Ghost at Skeleton Rock |
| The Disappearing Floor | The Mystery at Devil's Paw |
