Books about Detective and mystery stories (sorted alphabetically)
- Rayner-Slade Amalgamation J. S. Fletcher
- Red Bicycle Fergus Hume
- Red-headed Man Fergus Hume
- Red House Mystery A. A. Milne
- Red House Mystery A. A. Milne
- Red House on Rowan Street Lily A. Long
- Red Lodge: A Mystery of Campden Hill Victor Bridges
- Red Lottery Ticket Fortuné Du Boisgobey
- Red Money Fergus Hume
- Red Mouse: A Mystery Romance William Hamilton Osborne
- Red Redmaynes Eden Phillpotts
- Red Room William Le Queux
- Red Thumb Mark R. Austin Freeman
- Reuben Stone's discovery : or, The young miller of Torrent Bend Edward Stratemeyer
- R. Holmes & Co. John Kendrick Bangs
- Riddle and the Ring; or, Won by Nerve Gordon MacLaren
- Riddle of the Frozen Flame Thomas W. Hanshew and Mary E. Hanshew
- Riddle of the Mysterious Light Thomas W. Hanshew and Mary E. Hanshew
- Riddle of the Night Thomas W. Hanshew
- Riddle of the Purple Emperor Thomas W. Hanshew and Mary E. Hanshew
- Riddle of the Spinning Wheel Thomas W. Hanshew and Mary E. Hanshew
- Rikos ja rangaistus (Finnish) Fyodor Dostoyevsky
- Rival Campers Ashore; or, The Mystery of the Mill Ruel Perley Smith
- Roland Yorke Mrs. Henry Wood
- Romance of Elaine Arthur B. Reeve