Books about Detective and mystery stories (sorted alphabetically)
- Mystery of the Secret Band Edith Lavell
- Mystery of the Sycamore Carolyn Wells
- Mystery of the Yellow Room Gaston Leroux
- Mystery Queen Fergus Hume
- Mystery Ranch Arthur Chapman
- My Strangest Case Guy Boothby
- nameless man Natalie Sumner Lincoln
- Nan Sherwood at Palm Beach; Or, Strange Adventures Among The Orange Groves Annie Roe Carr
- Nan Sherwood at Pine Camp; Or, The Old Lumberman's Secret Annie Roe Carr
- Neljä naista ristillä: Jännitysromaani (Finnish) Maurice Leblanc
- Neljän merkit (Finnish) Arthur Conan Doyle
- Nest of Spies Pierre Souvestre and Marcel Allain
- Never-Fail Blake Arthur Stringer
- New Tenant E. Phillips Oppenheim
- Nick Carter Stories No. 135. April 10, 1915; Straight to the Goal; Or, Nick Carter's Queer Challenge Nicholas Carter
- Nick Carter Stories No. 138 May 1, 1915; The Traitors of the Tropics; or, Nick Carter's Royal Flush Nicholas Carter
- Nimble Ike, the Trick Ventriloquist: A Rousing Tale of Fun and Frolic Old Sleuth
- No. 13 Toroni: A Mystery Julius Regis
- Nobody's Man E. Phillips Oppenheim
- Nor Iron Bars a Cage.... Randall Garrett
- North Shore Mystery Henry Fletcher
- Notting Hill Mystery Charles Felix
- Number Seventeen Louis Tracy
- Old Broadbrim Into the Heart of Australia St. George Rathborne
- One of My Sons Anna Katharine Green