Books about Detective and mystery stories (sorted alphabetically)
- Penny Nichols and the Mystery of the Lost Key Joan Clark
- Penny Nichols Finds a Clue Joan Clark
- People's Man E. Phillips Oppenheim
- Perlycross: A Tale of the Western Hills R. D. Blackmore
- Persons Unknown" Virginia Tracy
- Peter Ruff and the Double Four E. Phillips Oppenheim
- Peter the Brazen: A Mystery Story of Modern China George F. Worts
- phantom hunter; or, love after death Edward Sylvester Ellis
- Philo Gubb, Correspondence-School Detective Ellis Parker Butler
- 'Phone Booth Mystery John Ironside
- Photographer's Evidence; Or, Clever but Crooked Nicholas Carter
- Piccadilly Puzzle: A Mysterious Story Fergus Hume
- Pied Piper of Mars Frederic Arnold Kummer
- Pimeyden ääniä: Romaani (Finnish) Sven Elvestad
- Pink Ears Murray Leinster
- Pink Shop Fergus Hume
- Pirates of Shan: A Rick Brant Science-Adventure Story Harold L. Goodwin
- Pit-Prop Syndicate Freeman Wills Crofts
- Place of Dragons: A Mystery William Le Queux
- Plot That Failed; or, When Men Conspire Nicholas Carter
- Plymouth Express Affair Agatha Christie
- Point of Testimony Carolyn Wells
- Poisoned Pen Arthur B. Reeve
- Poisoned Pen Arthur B. Reeve
- Polite People of Pudibundia R. A. Lafferty