 | Mystery of the Glowing Eye The Secret of the Forgotten City | Hardback |
 | The Bungalow Mystery / The Mystery at Lilac Inn | Hardback |
 | The Clue in the Crumbling Wall | Hardback |
| The Clue in the Jewel Box | Hardback |
 | The Clue in the Jewel Box The Secret in the Old Attic | Hardback |
 | The Clue in the Old Stagecoach The Mystery of the Fire Dragon | Hardback |
 | The Clue of the Dancing Puppet The Moonstone Castle Mystery | Hardback |
 | The Clue of the Whistling Bagpipes The Phantom of Pine Hill | Hardback |
 | The Ghost of Blackwood Hall The Clue of the Leaning Chimney | Hardback |
 | The Haunted Bridge The Clue of the Tapping Heels | Hardback |
 | The Haunted Showboat The Secret of the Golden Pavillion | Hardback |
 | The Mysterious Mannequin The Crooked Banister | Hardback |
 | The Mystery at the Ski Jump The Clue of the Velvet Mask | Hardback |
 | The Mystery of the 99 Steps The Clue in the Crossword Cipher | Hardback |
 | The Mystery of the Moss-Covered Mansion The Quest of the Missing Map | Hardback |
 | The Ringmaster's Secret The Scarlet Slipper Mystery | Hardback |
 | The Secret of Mirror Bay The Double Jinx Mystery | Hardback |
 | The Secret of the Old Clock The Hidden Staircase | Hardback |
 | The Secret of the Wooden Lady The Clue of the Black Keys | Hardback |
 | The Spider Sapphire Mystery The Invisible Intruder | Hardback |
 | The Witch Tree Symbol The Hidden Window Mystery | Hardback |
