By “The Mysterious Affair at Styles” by Agatha Christie is the first book featuring her famous detective, Hercule Poirot.
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Book Review: “The Mysterious Affair at Styles” by Agatha Christie
“The Mysterious Affair at Styles” by Agatha Christie is a classic murder mystery novel that was first published in 1920. The book marks the debut of detective Hercule Poirot and establishes Christie as the queen of crime fiction.