1. The Secret of Terror Castle
   The Secret of Terror Castle
   The Secret of Terror Castle is an American juvenile detective novel written by Robert Arthur, Jr. It is the first book in the "Three Investigators" series.- Plot :...
   
    (1964, by Robert Arthur)
2. The Mystery of the Stuttering Parrot
   The Mystery of the Stuttering Parrot
   The Mystery of the Stuttering Parrot by Robert Arthur, Jr. is the second in the Three Investigators series.-Plot summary:In only their second outing, the Three Investigators are hired by a friend of their patron, Alfred Hitchcock, to find his missing parrot...
   
    (1964, by Robert Arthur)
3. The Mystery of the Whispering Mummy
   The Mystery of the Whispering Mummy
   The Mystery of the Whispering Mummy is the third book in The Three Investigators series by Robert Arthur, Jr.. It was originally published in the USA by Random House in 1965...
   
    (1965, by Robert Arthur)
4. The Mystery of the Green Ghost (1965, by Robert Arthur)
5. The Mystery of the Vanishing Treasure
   The Mystery of the Vanishing Treasure
   The Mystery of the Vanishing Treasure is an American juvenile detective novel written by Robert Arthur, Jr. It is the 5th book in the "Three Investigators" series.- Plot :...
   
    (1966, by Robert Arthur)
6. The Secret of Skeleton Island (1966, by Robert Arthur)
7. The Mystery of the Fiery Eye (1967, by Robert Arthur)
8. The Mystery of the Silver Spider
   The Mystery of the Silver Spider
   The Mystery Of The Silver Spider is a book in the Three Investigators series.In this episode, the Three Investigators almost run into Prince Djaro with their car. Djaro is the soon to be prince of the fictional European state of Varania, a country which is still very conscious of old traditions and...
   
    (1967, by Robert Arthur)
9. The Mystery of the Screaming Clock (1968, by Robert Arthur)
10. The Mystery of the Moaning Cave (1968, by William Arden)
11. The Mystery of the Talking Skull (1969, by Robert Arthur)
12. The Mystery of the Laughing Shadow (1969, by William Arden)
13. The Secret of the Crooked Cat (1970, by William Arden)
14. The Mystery of the Coughing Dragon (1970, by Nick West)
15. The Mystery of the Flaming Footprints (1971, by M. V. Carey)
16. The Mystery of the Nervous Lion (1971, by Nick West)
17. The Mystery of the Singing Serpent (1972, by M. V. Carey)
18. The Mystery of the Shrinking House (1972, by William Arden)
19. The Secret of Phantom Lake (1973, by William Arden)
20. The Mystery of Monster Mountain (1973, by M. V. Carey)
21. The Secret of the Haunted Mirror (1974, by M. V. Carey)
22. The Mystery of the Dead Man's Riddle (1974, by William Arden)
23. The Mystery of the Invisible Dog (1975, by M. V. Carey)
24. The Mystery of Death Trap Mine (1976, by M. V. Carey)
25. The Mystery of the Dancing Devil (1976, by William Arden)
26. The Mystery of the Headless Horse (1977, by William Arden)
27. The Mystery of the Magic Circle (1978, by M. V. Carey)
28. The Mystery of the Deadly Double (1978, by William Arden)
29. The Mystery of the Sinister Scarecrow (1979, by M. V. Carey)
30. The Secret of Shark Reef (1979, by William Arden)
31. The Mystery of the Scar-Faced Beggar (1981, by M. V. Carey)
32. The Mystery of the Blazing Cliffs (1981, by M. V. Carey)
33. The Mystery of the Purple Pirate (1982, by William Arden)
34. The Mystery of the Wandering Cave Man (1982, by M. V. Carey)
35. The Mystery of the Kidnapped Whale (1983, by Marc Brandel)
36. The Mystery of the Missing Mermaid (1983, by M. V. Carey)
37. The Mystery of the Two-Toed Pigeon (1984, by Marc Brandel)
38. The Mystery of the Smashing Glass (1984, by William Arden)
39. The Mystery of the Trail of Terror (1984, by M. V. Carey)
40. The Mystery of the Rogues' Reunion (1985, by Marc Brandel)
41. The Mystery of the Creep-Show Crooks (1985, by M. V. Carey)
42. The Mystery of Wrecker's Rock (1986, by William Arden)
43. The Mystery of the Cranky Collector (1987, by M. V. Carey)

Find Your Fate Mysteries (1985–1987)

• RH1 Case of the Weeping Coffin (1985, by Megan Stine and H. William Stine)
• RH2 Case of the Dancing Dinosaur (by Rose Estes)
• RH3 Case of the House of Horrors (by Megan Stine and H. William Stine)
• RH4 Case of the Savage Statue (1987, by M.V. Carey)

Crimebusters (1989–1990)

1. Hot Wheels (1989, by William Arden)
2. Murder to Go (1989, by Megan Stine and H. William Stine)
3. Rough Stuff (1989, by G.H. Stone
   Gayle Lynds
   Gayle Lynds is an American author. A member of the U.S. Association for Intelligence Officers, she is known for being a bestselling novelist in the male-dominated genre of spy fiction or spy thrillers...
   
   )
4. Funny Business (1989, by William MacCay)
5. An Ear for Danger (1989, by Marc Brandel)
6. Thriller Diller (1989, by Megan Stine and H. William Stine) [retitled 'Hollywood Horror' in UK)
7. Reel Trouble (1989, by G.H. Stone
   Gayle Lynds
   Gayle Lynds is an American author. A member of the U.S. Association for Intelligence Officers, she is known for being a bestselling novelist in the male-dominated genre of spy fiction or spy thrillers...
   
   )
8. Shoot the Works (1990, by William MacCay)
9. Foul Play (1990, by Peter Lerangis
   Peter Lerangis
   Peter Lerangis is an author of children's and young-adult fiction.-Career:Lerangis's work includes The Viper's Nest and The Sword Thief, two titles in the New York Times–bestselling children's-book series The 39 Clues, the historical novel Smiler's Bones, the YA dark comedy-adventure novel wtf,...
   
   )
10. Long Shot (1990, by Megan Stine and H. William Stine)
11. Fatal Error (1990, by G.H. Stone
    Gayle Lynds
    Gayle Lynds is an American author. A member of the U.S. Association for Intelligence Officers, she is known for being a bestselling novelist in the male-dominated genre of spy fiction or spy thrillers...
    
    )
12. Brain Wash (published in Germany only in 2011, by Peter Lerangis
    Peter Lerangis
    Peter Lerangis is an author of children's and young-adult fiction.-Career:Lerangis's work includes The Viper's Nest and The Sword Thief, two titles in the New York Times–bestselling children's-book series The 39 Clues, the historical novel Smiler's Bones, the YA dark comedy-adventure novel wtf,...
    
    )
13. High Strung (published in Germany only in 2011, by G.H. Stone
    Gayle Lynds
    Gayle Lynds is an American author. A member of the U.S. Association for Intelligence Officers, she is known for being a bestselling novelist in the male-dominated genre of spy fiction or spy thrillers...
    
    )