Poirot Investigates is a short story collection written by Agatha Christie and first published in the UK by The Bodley Head in March 1924. In the eleven stories, famed eccentric detective Hercule Poirot solves a variety of mysteries involving greed, jealousy, and revenge.
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, and in the United States in 1920 and in the United Kingdom in 1921.
The Secret Adversary is the second published detective fiction novel by British writer Agatha Christie, first published in 1922 in the United Kingdom. The book introduces the characters of Tommy and Tuppence who feature in three other Christie novels and one collection of short stories.