Books about Detective and mystery stories (sorted alphabetically)
- Tracked by a Tattoo: A Mystery Fergus Hume
- Trackers of the Fog Pack; Or, Jack Ralston Flying Blind Ambrose Newcomb
- Tracks in the snow : Being the history of a crime Baron Godfrey Rathbone Benson Charnwood
- tragedy of love and hate : or, a woman's vow Bertha M. Clay
- Trent's Last Case E. C. Bentley
- Trevor case Natalie Sumner Lincoln
- Triple Spies Roy J. Snell
- Twelve Times Zero Howard Browne
- Twin Mystery; Or, A Dashing Rescue Nicholas Carter
- Twin Ventriloquists; or, Nimble Ike and Jack the Juggler Old Sleuth
- Two Wonderful Detectives; Or, Jack and Gil's Marvelous Skill Old Sleuth
- Uncle Sam, Detective William Atherton DuPuy
- Under Honour's Flag Eric Lisle
- Under Lock and Key: A Story. Volume 1 (of 3) T. W. Speight
- Under Lock and Key: A Story. Volume 2 (of 3) T. W. Speight
- Under Lock and Key: A Story. Volume 3 (of 3) T. W. Speight
- Under the Tiger's Claws; Or, A Struggle for the Right Nicholas Carter
- Under Three Flags: A Story of Mystery Bert Leston Taylor and Alvin T. Thoits
- Undetected George O. Smith
- Unnatural death Dorothy L. Sayers
- unpleasantness at the Bellona Club Dorothy L. Sayers
- unseen ear Natalie Sumner Lincoln
- Vainottu: Romaani (Finnish) Arthur Conan Doyle
- Välkehtivä Rubiini (Finnish) J. S. Fletcher
- Valley of Fear Arthur Conan Doyle