Books about Detective and mystery stories (sorted alphabetically)
- Within an Inch of His Life Emile Gaboriau
- Within the Law: From the Play of Bayard Veiller Marvin Dana and Bayard Veiller
- With Links of Steel; Or, The Peril of the Unknown Nicholas Carter
- Wizard Will, the Wonder Worker Prentiss Ingraham
- Woman at Bay; Or, A Fiend in Skirts Nicholas Carter
- Woman from Outside Hulbert Footner
- Woman in Black E. C. Bentley
- Woman in the Alcove Anna Katharine Green
- woman's debt William Le Queux
- Wooden Hand: A Detective Story Fergus Hume
- wrong letter Walter S. Masterman
- Wylder's Hand Joseph Sheridan Le Fanu
- X Y Z: A Detective Story Anna Katharine Green
- Yellow Claw Sax Rohmer
- Yellow Crayon E. Phillips Oppenheim
- Yellow Face Fred M. White
- Yellow House; Master of Men E. Phillips Oppenheim
- Yellow Streak Valentine Williams
- Young Blood E. W. Hornung
- Young Engineers on the Gulf H. Irving Hancock
- 下宿人 (Japanese) Marie Belloc Lowndes
- 苦悶の欄 (Japanese) Earl Derr Biggers