- Frank Tallis
- Mortal Mischief Published in the US as A Death in Vienna
- Vienna Blood
- Fatal Lies
- Shirley Tallman
- Murder on Nob Hill
- The Russian Hill Murders
- The Cliff House Strangler
- A. C. Tassie
- Death of a Blue Hero
- Death of a Vestal Virgin
- J. E. Tate
- Andrew Taylor 1 (The Lydmouth Series)
- An Air that Kills
- The Mortal Sickness
- The Lover of the Grave
- The Suffocating Night
- The Woman Who Loved Elizabeth David (short story)
- Where Roses Fade
- Death's Own Door
- Call The Dying
- Naked to the Hangman
- Andrew Taylor 2 (Edgar Allan Poe Series)
- The American Boy
- An Unpardonable Crime
- Andrew Taylor 3 (Standalone)
- D. J. Taylor
- Kept: A Victorian Mystery
- R. L. Tecklenburg
- Lou Jane Temple
- The Spice Box
- Death du Jour
- Josephine Tey
- Donald Thomas (Sherlock Holmes Pastiches)
- The Secret Cases of Sherlock Holmes
- Sherlock Holmes and the Running Noose
- Sherlock Holmes and the Voice from the Crypt
- The Execution of Sherlock Holmes
- Donald Thomas (Inspector Swain series)
- Belladonna: A Lewis Carroll Nightmare (aka Mad Hatter Summer)
- Sherlock Holmes and the Running Noose
- Jekyll, Alias Hyde
- The Ripper's Apprentice
- The Arrest of Scotland Yard
- Edwin Thomas
- The Blighted Cliffs
- The Chains of Albion
- Treason's River
- Leslie Thomas
- Will Thomas
- Some Danger Involved
- To Kingdom Come
- The Limestone Text
- The Hellfire Conspiracy
- The Black Hand
- Cynthia Thomason
- Brian Thompson
- David Thompson
- Victoria Thompson
- Murder on Astor Place
- Murder on St. Mark's Place
- Murder on Gramercy Park
- Murder on Washington Square
- Murder on Mulberry Bend
- Murder on Marble Row
- Murder on Lenox Hill
- Murder in Little Italy
- Murder in Chinatown
- Murder on Bank Street
- June Thomson
- The Secret Files of Sherlock Holmes
- The Secret Chronicles of Sherlock Holmes
- The Secret Journals of Sherlock Holmes
- The Secret Documents of Sherlock Holmes
- The Secret Notebooks of Sherlock Holmes
- Francis John Thornton
- The Snake Harvest
- Ceremony in Scarlet
- Green Lorelei
- Louise Titchener
- Betsy Tobin
- Charles Todd (Rutledge Series)
- Test of Wills
- Wings of Fire
- Search the Dark
- Legacy of the Dead
- A Fearsome Doubt
- A Cold Treachery
- A Long Shadow
- A False Mirror
- A Pale Horse
- Charles Todd (standalone)
- Marilyn Todd (Claudia Series)
- I, Claudia
- Virgin Territory
- Man Eater
- Wolf Whistle
- Jail Bait
- Black Salamander
- Dream Boat
- Dark Horse
- Second Act
- Widow's Pique
- Stone Cold
- Sour Grapes
- Scorpion Rising
- Marilyn Todd (Ilionas Series)
- Teona Tone
- Lady on the Line
- Full Cry
- Peter Tonkin
- The Point of Death
- One Head Too Many
- The Hound of the Borders
- The Silent Woman
- Morley Torgov
- Leonard Tourney (Matthew Stock Series)
- The Players' Boy is Dead
- Low Treason
- Familiar Spirits
- Bartholomew Fair
- Old Saxon Blood
- Knaves Templar
- Witness of Bones
- Frobisher's Savage
- Leonard Tourney (Shakespeare Series)
- Peter Tremayne (Aka Peter Beresford Ellis) - Sister Fidelma stories
- Absolution by Murder
- Shroud for the Archbishop
- Suffer Little Children
- The Subtle Serpent
- The Spider's Web
- Valley of the Shadows
- The Monk Who Vanished
- Act of Mercy
- Hemlock at Vespers (short stories)
- Our Lady of Darkness
- Smoke in the Wind
- The Haunted Abbot
- Badger's Moon
- Whispers of the Dead (short stories)
- The Leper's Bell
- Master of Souls
- A Prayer for the Damned
- Dancing with Demons
- The Council of the Cursed
- Peter Tremayne (Aka Peter Beresford Ellis) - non-Fidelma Anthology
- An Ensuing Evil and Others: Fourteen Historical Mystery Stories
- M. J. Trow
- The Adventures of Inspector Lestrade (aka The Supreme Adventure of Inspector Lestrade)
- Brigade
- Lestrade and the Hallowed House
- Lestrade and the Leviathan
- Lestrade and the Brother of Death
- Lestrade and the Ripper
- Lestrade and the Deadly Game
- Lestrade and the Guardian Angel
- Lestrade and the Gift of the Prince
- Lestrade and the Magpie
- Lestrade and the Dead Man’s Hand
- Lestrade and the Sign of Nine
- Lestrade and the Sawdust Ring
- Lestrade and the Mirror of Murder
- Lestrade and the Kiss of Horus
- Lestrade and the Devil’s Own
- Howard Turk
- Peter Tyzack
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