The Mysterious Affair at Styles
By Agatha Christie
Cover: Strandgade, Sunshine (c. 1906) by Vilhelm Hammershøi (1864-1916) · Cleveland Museum of Art · CC0
The Mysterious Affair at Styles is the first mystery novel by British writer Agatha Christie, introducing her fictional detective Hercule Poirot. It was written in the middle of the First World War, in 1916, and first published by John Lane in the United States in October 1920 and in the United Kingdom by The Bodley Head (John Lane's UK company) on 21 January 1921.
Summary source: Wikipedia: The Mysterious Affair at Styles · CC BY-SA 4.0