The crime novels of Agatha Christie
1921 The Mysterious affair at Styles
1922 The Secret Adversary
1923 The Murder on the Links
1924 The Man in the Brown Suit
1925 The Secret of Chimneys
1925 Poirot Investigates
1926 The Murder of Roger Ackroyd
1927 The Big Four
1928 The Mystery of the Blue Train