Books about Detective and mystery stories (sorted alphabetically)
- Rome Express Arthur Griffiths
- Room with the Tassels Carolyn Wells
- Root of All Evil J. S. Fletcher
- Rover Boys in Business; Or, The Search for the Missing Bonds Edward Stratemeyer
- Rover Boys in New York; Or, Saving Their Father's Honor Edward Stratemeyer
- Rover Boys in Southern Waters; or, The Deserted Steam Yacht Edward Stratemeyer
- Rover Boys in the Air; Or, From College Campus to the Clouds Edward Stratemeyer
- Rover Boys on Snowshoe Island; or, The Old Lumberman's Treasure Box Edward Stratemeyer
- Rover Boys winning a fortune; or, Strenuous days ashore and afloat Edward Stratemeyer
- Royal Prisoner Pierre Souvestre and Marcel Allain
- Ruth Fielding At College; or, The Missing Examination Papers Alice B. Emerson
- Sacred Herb Fergus Hume
- Saintsbury Affair Lily A. Long
- Salaperäinen vihollinen: Kertomus salapoliisi Asbjörn Kragin elämästä (Finnish) Sven Elvestad
- Salapoliisijuttu sekin y.m. kertomuksia (Finnish) Mark Twain
- Sämtliche Werke 1-2: Rodion Raskolnikoff (Schuld und Sühne) (German) Fyodor Dostoyevsky
- Samuel Boyd of Catchpole Square: A Mystery B. L. Farjeon
- Scarhaven Keep J. S. Fletcher
- Scarlet Bat: A Detective Story Fergus Hume
- Scarlet Lake Mystery: A Rick Brant Science-Adventure Story Harold L. Goodwin
- Scott Burton and the Timber Thieves Edward G. Cheyney
- Scott Burton on the Range Edward G. Cheyney
- Sealed Message Fergus Hume
- sea mystery : An Inspector French detective story Freeman Wills Crofts
- Secret Adversary Agatha Christie