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- Rough stuff, by G.H. Stone ; based on characters by Robert Arthur
- The three investigators in The mystery of the purple pirate, by William Arden ; based on characters created by Robert Arthur
- The three investigators in The mystery of the invisible dog, by M.V. Carey ; based on characters created by Robert Arthur
- Alfred Hitchcock and the three investigators in The mystery of the headless horse, based on characters created by Robert Arthur, text by William Arden [i.e. D. Lynds] ; illustrated by Jack Hearne
- Alfred Hitchcock and the three investigators in The mystery of Monster Mountain., Text by M. V. Carey. Based on characters created by Robert Arthur. Illustrated by Jack Hearne
- Reel trouble, by G.H. Stone ; based on characters created by Robert Arthur
- Alfred Hitchcock and the Three Investigators in The mystery of the flaming footprints., Text by M. V. Carey. Based on characters created by Robert Arthur. Illustrated by Harry Kane
- Funny business, by William McCay ; based on characters created by Robert Arthur
- An ear for danger, by Marc Brandel ; based on characters created by Robert Arthur
- Alfred Hitchcock and the three investigators in The mystery of the sinister scarecrow, text by M. V. Carey ; based on characters created by Robert Arthur