An Agatha Christie Collection: The Mysterious Affair at Styles, The Murder on the Links, Poirot Investigates, The Secret Adversary & The Man in the Brown Suit FIVE BOOKS IN ONE! In one volume, Five of Agatha Christie's early Hercule Poirot books. Included in this volume: The Mysterious Affair at Styles The Murder on the Links Poirot Investigates The Secret Adversary & The Man In The Brown Suit