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Some detectives show up once and vanish. Others walk into a first book and stay for decades, sometimes outliving their authors. The novels below are the debut appearances of characters who went on to anchor some of crime fiction’s longest-running series.
Each entry covers the book, the year it appeared, and what followed. The details come from publication history that is well established, so nothing here depends on recent news.
A Study in Scarlet (1887): Sherlock Holmes

Arthur Conan Doyle’s first Sherlock Holmes story appeared in Beeton’s Christmas Annual in 1887. It also introduced Dr. John Watson, who narrates and gives readers a way into Holmes’s methods. The book is short and a little lopsided, with a long flashback to the American West in its second half.
Doyle went on to write four novels and fifty-six short stories about the detective. Few characters in fiction have been adapted as often, and new versions of Holmes keep appearing on screen and in print.
The Mysterious Affair at Styles (1920): Hercule Poirot

Agatha Christie’s first published novel brought Belgian detective Hercule Poirot to readers in 1920. The story is set in an English country house, and Captain Hastings narrates it. That pairing of a brilliant outsider and a loyal, slightly dim friend echoed Holmes and Watson.
Poirot appeared in…
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Author : Matthias Binder
Publish date : 2026-10-13 10:01:00
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