Books about Detective and mystery stories (sorted alphabetically)
- Lukkoneula (Finnish) J. S. Fletcher
- Luminous Face Carolyn Wells
- Lynne Courtin salaisuus (Finnish) J. S. Fletcher
- Maahengen salaisuus: Tohtori salapoliisina (Finnish) Valter Juva
- Madeline Payne, the Detective's Daughter Lawrence L. Lynch
- Mademoiselle of Monte Carlo William Le Queux
- Madman From Earth Keith Laumer
- main froide (French) Fortuné Du Boisgobey
- Malcolm Sage, Detective Herbert George Jenkins
- Malefactor E. Phillips Oppenheim
- Mandarin's Fan Fergus Hume
- Mandarin's Fan Fergus Hume
- Man Higher Up William MacHarg and Edwin Balmer
- Man in Lower Ten Mary Roberts Rinehart
- Man Inside Natalie Sumner Lincoln
- Man in the Brown Suit Agatha Christie
- Mansion of Mystery Chester K. Steele
- Man Who Drove the Car Max Pemberton
- Man Who Fell Through the Earth Carolyn Wells
- Man Who Flew Charles D. Cunningham
- Man Who Knew Edgar Wallace
- Man Who was Thursday, A Nightmare G. K. Chesterton
- Man Who Was Thursday: A Nightmare G. K. Chesterton
- Man Without a Conscience; Or, From Rogue to Convict Nicholas Carter
- Mardi Gras Mystery H. Bedford-Jones