Classic mystery/adventure stories feature three boys--Jupiter Jones, Pete Crenshaw, and Bob Andrews--who establish a detective firm with the motto "We Investigate Anything".
Series Authors: William Arden , Robert Arthur , Marc Brandel , Mary V. Carey , Nick West
| # 6 The Secret of Skeleton Island 152 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 32 The Mystery of the Blazing Cliffs 180 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 11 The Mystery of the Talking Skull 196 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 35 The Mystery of the Kidnapped Whale 163 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Marc Brandel | |
| # 9 The Mystery of the Screaming Clock 194 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 2 The Mystery of the Stuttering Parrot 174 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 43 The Mystery of the Cranky Collector (©1987) 182 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 42 The Secret Of Wrecker's Rock (©1986) 184 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 41 The Mystery of the Creep-Show Crooks (©1985) 177 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey , Robert Arthur | |
| # 40 Mystery of the Rogues' Reunion (©1985) 176 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Marc Brandel , Robert Arthur | |
| # 29 Mystery of the Sinister Scarecrow 151 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 27 Mystery of the Magic Circle 143 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey , Robert Arthur | |
| # 8 The Mystery of the Silver Spider 168 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 5 the Mystery of the Vanishing Treasure | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 4 The Mystery of the Green Ghost 179 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 3 The Mystery of the Whispering Mummy 180 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 39 Mystery of the Trail of Terror (©1984) | |
| Mystery Young Adult Author(s): Mary V. Carey | |
| # 38 The Mystery Of The Smashing Glass (©1984) 165 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 37 The Mystery of the Two-Toed Pigeon (©1984) 145 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Marc Brandel , Robert Arthur | |
| # 23 Mystery of the Invisible Dog 148 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 20 Mystery of Monster Mountain 142 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey , Robert Arthur | |
| # 17 The Mystery of the Singing Serpent 146 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 16 The Mystery of the Nervous Lion 143 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Nick West , Robert Arthur | |
| # 15 Mystery of the Flaming Footprints 175 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey , Robert Arthur | |
| # 14 Mystery of the Coughing Dragon 166 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Nick West , Robert Arthur | |
| # 7 The Mystery of the Fiery Eye 164 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
| # 36 Mystery of the Missing Mermaid (©1983) | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey , Robert Arthur | |
| # 34 The Mystery of the Wandering Cave Man 183 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 33 The Mystery Of The Purple Pirate (©1982) | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| the Mystery of the Scar Faced Beggar (©1981) 181 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Mary V. Carey | |
| # 30 The Secret Of Shark Reef (©1979) 181 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden , Robert Arthur | |
| # 28 The Mystery Of The Deadly Double (©1978) 140 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 26 The Mystery Of The Headless Horse (©1977) | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 25 The Mystery Of The Dancing Devil (©1976) | |
| Mystery Young Adult Author(s): William Arden | |
| # 22 The Mystery Of The Dead Man's Riddle (©1974) 145 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 19 The Secret Of Phantom Lake (©1973) 141 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 18 The Mystery Of The Shrinking House (©1972) 153 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 13 The Secret Of The Crooked Cat (©1970) 168 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 12 The Mystery Of The Laughing Shadow (©1969) 157 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 10 The Mystery Of The Moaning Cave (©1968) 176 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): William Arden | |
| # 1 The Secret of Terror Castle (©1964) 165 pp. | |
| Mystery Young Adult Amazon US PB Amazon Canada PB Author(s): Robert Arthur | |
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