The Secret Adversary is a work of detective fiction by Agatha Christie and first published in the United Kingdom by The Bodley Head in January 1922 and in the United States by Dodd, Mead and Company later in that same year The book introduces the characters of Tommy and Tuppence who feature in three other Christie books and one collection of short stories written throughout her writing career. The Mysterious Affair at Styles is a detective novel by Agatha Christie. It was written in 1916.Styles was Christie's first published novel, introducing Hercule Poirot, Inspector (later, Chief Inspector) Japp, and Lieutenant Hastings (later, Captain). The story is told in first person by Hastings and features many of the elements that have become icons of the Golden Age of Detective Fiction, largely due to Christie's influence. It is set in a large, isolated country manor. There are a half-dozen suspects, most of whom are hiding facts about themselves. The book includes maps of the house, the murder scene, and a drawing of a fragment of a will, as well as a number of red herrings and surprise plot twists. Features: • Introduction and short biography of author and other text decoration. • Active TOC: You can navigate through the entire collection via a main table of contents • Re-arranged texts for the best display on Kobo, PC and every e-Reader device.