1. The Secret of the Mansion
 2. The Red Trailer Mystery
 3. The Gatehouse Mystery
 4. The Mysterious Visitor
 5. The Mystery Off Glen Road
 6. The Mystery in Arizona
 7. The Mysterious Code
 8. The Black Jacket Mystery
 9. The Happy Valley Mystery
10. The Marshland Mystery
11. The Mystery at Bob-White Cave
12. The Mystery of the Blinking Eye
13. The Mystery on Cobbett's Island

14. The Mystery of the Emeralds
15. The Mystery on the Mississippi
16. The Mystery of the Missing Heiress
17. The Mystery of the Uninvited Guest
18. The Mystery of the Phantom Grasshopper
19. The Secret of the Unseen Treasure
20. The Mystery Off Old Telegraph Road
21. The Mystery of the Castaway Children
22. The Mystery at Mead's Mountain
23. The Mystery of the Queen's Necklace
24. The Mystery at Saratoga
25. The Sasquatch Mystery
26. The Mystery of the Headless Horseman

27. The Mystery of the Ghostly Galleon
28. The Hudson River Mystery
29. The Mystery of the Velvet Gown
30. The Mystery of the Midnight Marauder
31. The Mystery at Maypenny's
32. The Mystery of the Whispering Witch
33. The Mystery of the Vanishing Victim
34. The Mystery of the Missing Millionaire
35. The Mystery of the Memorial Day Fir|
36. The Mystery of the Antique Doll
37. The Pet Show Mystery
38. The Indian Burial Ground Mystery
39. The Mystery of the Galloping Ghost