1. The Secret of the Old Clock  2. The Hidden Staircase  3. The Bungalow Mystery  4. The Mystery at Lilac Inn  5. The Secret of Shadow Ranch  6. The Secret of Red Gate Farm  7. The Clue in the Diary  8. Nancy's Mysterious Letter  9. The Sign of the Twisted Candles 10. The Password to Larkspur Lane 11. The Clue of the Broken Locket 12. The Message in the Hollow Oak 13. The Mystery of the Ivory Charm 14. The Whispering Statue 15. The Haunted Bridge 16. The Clue of the Tapping Heels 17. The Mystery of the Brass Bound Trunk 18. The Mystery of the Moss-Covered Mansion 19. The Quest of the Missing Map 20. The Clue in the Jewel Box

21. The Secret in the Old Attic 22. The Clue in the Crumbling Wall 23. The Mystery of the Tolling Bell 24. The Clue in the Old Album 25. The Ghost of Blackwood Hall 26. The Clue of the Leaning Chimney 27. The Secret of the Wooden Lady 28. The Clue of the Black Keys 29. The Mystery at the Ski Jump 30. The Clue of the Velvet Mask 31. The Ringmaster's Secret 32. The Scarlet Slipper Mystery 33. The Witch Tree Symbol 34. The Hidden Window Mystery 35. The Haunted Showboat 36. The Secret of the Golden Pavilion 37. The Clue in the Old Stagecoach 38. The Mystery of the Fire Dragon 39. The Clue of the Dancing Puppet 40. The Moonstone Castle Mystery

41. The Clue of the Whistling Bagpipes 42. The Phantom of Pine Hill 43. The Mystery of the 99 Steps 44. The Clue in the Crossword Cipher 45. The Spider Sapphire Mystery 46. The Invisible Intruder 47. The Mysterious Mannequin 48. The Crooked Banister 49. The Secret of Mirror Bay 50. The Double Jinx Mystery 51. The Mystery of the Glowing Eye 52. The Secret of the Forgotten City 53. The Sky Phantom 54. The Strange Message in the Parchment 55. The Mystery of Crocodile Island 56. The Thirteenth Pearl