46 books in series
Die drei Fragezeichen (Original)
Die drei Fragezeichen (Original) is a 46-book series with 46 primary works first released in 1964 with contributions by Robert Arthur, William Arden, Investigators Three, Nick West, M.V. Carey, Marc Brandel, Megan Stine, Henry William Stine, and Peter Lerangis.
| #1 |  The Secret of Terror Castle
| 3.64 | 11 reads | ||
| #2 |  The Mystery of the Whispering Mummy
| 3.29 | 7 reads | ||
| #3 |  The Mystery of the Fiery Eye
| 3 | 1 read | ||
| #4 |  The Mystery of the Screaming Clock
| 3 | 1 read | ||
| #5 |  The Mystery of the Talking Skull
| 3 | 2 reads | ||
| #6 |  The Mystery of the Laughing Shadow
| 3 | 3 reads | ||
| #7 |  Die drei ??? und die schwarze Katze
| 3 | 1 read | ||
| #7 |  The Secret of the Crooked Cat
| 2 | 1 read | ||
| #7 |  Tajomstvo pruhovanej mačky Tajomstvo pruhovanej mačky
| 0 | 1 read | ||
| #7 |  Alfred Hitchcock og De tre Detektiver : Kattemysteriet
| 4 | 1 read | ||
| #8 |  Alfred Hitchcock og De tre Detektiver Alfred Hitchcock og De tre Detektiver : Papegøjemysteriet
| 4 | 1 read | ||
| #9 |  The Mystery of the Coughing Dragon
| 3 | 4 reads | ||
| #10 |  Myst Vanishing Treasu Ah05 3in
| 3 | 1 read | ||
| #11 |  The Secret of Skeleton Island
| 3 | 1 read | ||
| #11 |  Alfred Hitchcock og De tre Detektiver Alfred Hitchcock og De tre Detektiver : Skeletøens hemmelighed
| 4 | 1 read | ||
| #11 |  Tajomstvo ostrova kostier Tajomstvo ostrova kostier
| 0 | 1 read | ||
| #12 |  The Mystery of the Nervous Lion
| 3 | 1 read | ||
| #13 |  The Mystery of the Moaning Cave
| 4 | 1 read | ||
| #13 |  Záhada stonajúcej jaskyne
| 0 | 1 read | ||
| #14 |  Die drei ??? und der grüne Geist
| 4.5 | 2 reads | ||
| #15 |  Den syngende slange
| 3.5 | 2 reads | ||
| #16 |  The Mystery of the Shrinking House
| 4 | 1 read | ||
| #17 |  The Mystery of Monster Mountain
| 3.33 | 3 reads | ||
| #18 |  The Secret of Phantom Lake
| 4 | 2 reads | ||
| #19 |  Alfred Hitchcock og De tre Detektiver Alfred Hitchcock og De tre Detektiver : Ånden i spejlet
| 4 | 1 read | ||
| #19 |  Tajomstvo mátožného zrkadla Tajomstvo mátožného zrkadla
| 0 | 1 read | ||
| #19 |  The Secret of the Haunted Mirror
| 0 | 0 reads | ||
| #20 |  The Mystery of the Dead Man's Riddle
| 3 | 1 read | ||
| #21 |  Záhada neviditeľného psa
| 0 | 1 read | ||
| #21 |  Den usynlige hund
| 4 | 1 read | ||
| #21 | The Mystery of the Invisible Dog - M. V. Carey The Mystery of the Invisible Dog - M. V. Carey
| 3 | 1 read | ||
| #22 |  The Mystery of the Flaming Footprints
| 3.67 | 3 reads | ||
| #23 |  The Mystery of the Dancing Devil
| 3 | 2 reads | ||
| #24 | Alfred Hitchcock og De tre Detektiver Alfred Hitchcock og De tre Detektiver : Dødsfælden
| 4 | 1 read | ||
| #24 | The Mystery of the Death Trap Mine The Mystery of the Death Trap Mine
| 3 | 1 read | ||
| #25 |  The Mystery of the Headless Horse
| 3.5 | 2 reads | ||
| #26 |  Myst Silver Spider Ah08 3i
| 3 | 3 reads | ||
| #27 |  Záhada magického kruhu
| 0 | 1 read | ||
| #27 |  Alfred Hitchcock og De tre Detektiver Alfred Hitchcock og De tre Detektiver : Den magiske cirkel
| 4 | 1 read | ||
| #28 |  Mystery of the Deadly Double
| 3 | 1 read | ||
| #28 |  Alfred Hitchcock og De tre Detektiver : Dobbeltgænger-mysteriet
| 4 | 1 read | ||
| #29 |  The Secret of Shark Reef
| 3 | 1 read | ||
| #30 | The Mystery of the Scar-Faced Beggar The Mystery of the Scar-Faced Beggar
| 0 | 0 reads | ||
| #31 |  The Mystery of the Sinister Scarecrow
| 4 | 1 read | ||
| #32 |  The Mystery of the Blazing Cliffs
| 3 | 1 read | ||
| #32 |  Mystery of the Blazing Cliffs
| 0 | 0 reads | ||
| #32 |  Záhada planúcich brál
| 0 | 1 read | ||
| #33 |  Záhada purpurového piráta
| 0 | 1 read | ||
| #33 |  The Mystery of the Purple Pirate
| 3 | 1 read | ||
| #34 |  The Mystery of the Wandering Caveman
| 0 | 0 reads | ||
| #34 |  The Mystery of the Wandering Cave Man The Mystery of the Wandering Cave Man
| 3 | 1 read | ||
| #35 |  Die drei ??? und der heimliche Hehler
| 3 | 1 read | ||
| #35 |  The Mystery of the Missing Mermaid
| 3 | 1 read | ||
| #36 |  The Mystery of the Kidnapped Whale
| 3 | 1 read | ||
| #37 |  Tajemnica gołębia o dwóch pazurach
| 0 | 1 read | ||
| #38 |  The Mystery of the Trail of Terror
| 3 | 1 read | ||
| #42 |  The Mystery of the Creep-Show Crooks
| 3 | 1 read | ||
| #43 |  The Mystery of the Rogues' Reunion
| 4 | 1 read | ||
| #44 |  The Mystery of Wreckers' Rock
| 3 | 1 read | ||
| #45 |  The Mystery of the Cranky Collector
| 3 | 1 read | ||
| #49 | Hot Wheels Hot Wheels
| 0 | 0 reads | ||
| #51 |  Thriller Diller
| 0 | 0 reads | ||
| #53 |  Die drei ??? Gekaufte Spieler
| 3 | 1 read | ||
| #54 |  Crimebusters 9 - Foul Play
| 0 | 0 reads |