The Mysterious Affair at Styles is a detective novel by British writer Agatha Christie. It was written in the middle of the First World War in 1916. Styles was Christie's first published novel. It introduced Hercule Poirot, Inspector (later, Chief Inspector) Japp, and Arthur Hastings. Poirot, a Belgian refugee of the Great War, is settling in England near the home of Emily Inglethorp, who helped him to his new life. His friend Hastings arrives as a guest at her home. When the woman is killed, Poirot uses his detective skills to solve the mystery. This first mystery novel by Agatha Christie was well received by reviewers.