- Children of the Plantation
- Chimera
- China in Her Hand
- Chocolate Chip Murder
- Chocolates and Cyanide
- Chosen for Death (The Thea Kozak Mystery Series, Book 1)
- Christmas Adventure
- Christmas Mysteries 1: A Christmas Journey & A Christmas Visitor
- Christmas Mysteries 2: A Christmas Grace & A Christmas Odyssey
- Christmas, Corpses, and Clockwork Kittens
- Chronicles of Martin Hewitt
- Chronicles of Melhampton
- Chłód
- Cimarron Rose
- Circumstantial Evidence
- Circumstantial Evidence and Other Stories
- City of Gold and Shadows
- City Primeval
- Civility Rules
- Claires obscures à Oléron
- Clarence–Private
- Clarity Must Prevail
- Classic Cashes In
- Classic in the Barn
- Classic in the Dock
- Classic Mistake
- Classified as Murder
- Claws for Concern
- CLEANER WANTED
- Cleaning is Murder
- Clear and Present Danger
- Cleek
- Cleek of Scotland Yard
- Cleek, the Master Detective
- Cleek: the Man of the Forty Faces
- Clipped Wings
- Close Range
- Close Up on Murder
- Closed Casket
- Club Domina
- Clubfoot the Avenger
- Clàradh
- Cobalt
- Cockfighter
- Cocoa Crush
- The Ryer Avenue Story
- Coffin, Scarcely Used
- Cold Comfort
- Cold Hands
- Cold Heart Creek
- Cold Is the Grave
- Cold Press - A Gripping British Mystery Thriller
- Cold Trail
- Cold Waters
- Cold Wind
- Colección de Sherlock Holmes
- Coleção Especial Sherlock Holmes
- Collared
- Colonel Butler's Wolf
- Colony
- Come Again, My Love (Burns! Mystery 7)
- Come Away Death
- Come Morning
- Come Sherlock Holmes salvò il Natale
- Come Softly To Me
- Come What May
- Comme font les reptiles
- Complete Adventure Mystery Detective of A. E. W. Mason
- Complete Ashton-Kirk Mystery Detective of John T. McIntyre
- Complete Bulldog Drummond Mystery
- Complete Detective Dr. John Thorndyke of R. Austin Freeman
- Complete Fantômas series Detective of Marcel Allain and Pierre Souvestre
- Complete Father Brown Mystery Detective of G. K. Chesterton
- Complete Fu Manchu Gaston Max Series of Sax Rohmer
- Complete Max Carrados & Kai Lung Detective of Ernest Bramah
- Complete Mysteries of a Blind Detective, Max Carrados
- Complete Mystery Detective & Science of Cleveland Moffett
- Complete Mystery Detective of Allan Pinkerton
- Complete Mystery Detective of Arthur Morrison (Illustrated)
- Complete Mystery Detective of B. L. Farjeon
- Complete Mystery Detective of Baroness Orczy
- Complete Mystery Detective of H. C. Bailey
- Complete Mystery Detective Romance of E. W. Hornung
- Complete Mystery Fantasy of Hugh Lloyd
- Complete Mystery Humous & Plays of A. A. Milne
- Complete Mystery of Fergus Hume
- Complete Mystery Thriller of Louis Tracy
- Complete Mystery Thriller Satire Religion of G. K. Chesterton
- Complete Mystery War of H. C. McNeile
- Complete Pulp & Thriller of E. Phillips Oppenheim
- Complete Sherlock Holmes Novels
- Complete Sherlock Holmes of Arthur Conan Doyle
- Complete Tales of Terror and Mystery of Arthur Conan Doyle
- Complete Thriller Suspense of Edgar Wallace
- Complete Works of Oscar Wilde
- Conan Doyle - Oeuvres
- Conceited, Maybe
- Concordances of the Red Serpent
- Confession of Sin - Not All Secrets Should be Kept
- Confessions from the Clink
- Cons, Scams and Grifts
- Consider the Lilies
- Consider Yourself Dead
- Conspiracy of Silence
- Constable Guard Thyself
- Constance Dunlap
- Consulting Detective. Criminologia e scienze investigative nella saga di Sherlock Holmes
- Containerkvinnan
- Contract Null and Void
- Control:Escape
- Convenient Prey
- Cooking is Murder
- Cop Killer
- Coração de Confiança
- Core of Evil
- Cornish Pastiche A Murder Mystery
- Corridors of the Night
- Corridors of the Night (William Monk Mystery, Book 21)
- Cost
- Costumed Foolery
- Countdown to Death
- Counterfeit
- Counterfeit Confections