By “The Mysterious Affair at Styles” by Agatha Christie is the first book featuring her famous detective, Hercule Poirot.
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.