Books about Detective and mystery stories (sorted alphabetically)
- Markenmore Mystery J. S. Fletcher
- Markenmoren salaisuus (Finnish) J. S. Fletcher
- Mark of Cain Carolyn Wells
- Mary Louise L. Frank Baum
- Mary Louise Solves a Mystery L. Frank Baum
- Mary Regan Leroy Scott
- master criminal G. Sidney Paternoster
- Master Detective: Being Some Further Investigations of Christopher Quarles Percy James Brebner
- Master Hand: The Story of a Crime Richard Dallas
- Master Mummer E. Phillips Oppenheim
- Master Mystery Arthur B. Reeve and John W. Grey
- Master of Mysteries L. T. Meade and Robert Eustace
- Masterpieces of Mystery in Four Volumes: Detective Stories
- Masterpieces of Mystery in Four Volumes: Ghost Stories
- Masterpieces of Mystery in Four Volumes: Mystic-Humorous Stories
- Masterpieces of Mystery in Four Volumes: Riddle Stories
- Master Tales of Mystery, Volume 3
- Mayor's Wife Anna Katharine Green
- Mazaroffin murhajuttu (Finnish) J. S. Fletcher
- Meet the Tiger Leslie Charteris
- Meg of Mystery Mountain Grace May North
- Mercer Boys in the Ghost Patrol Capwell Wyckoff
- Mercer Boys' Mystery Case Capwell Wyckoff
- Mercer Boys on a Treasure Hunt Capwell Wyckoff
- Meredith Mystery Natalie Sumner Lincoln