| has gloss | eng: The works by Agatha Christie of the "Middle Period" (representing the years 1934 to 1946) are often regarded as Agatha Christies finest works. Novels | class="wikitable" !Yearpublished!!Title!!Detectives |- |1920||The Mysterious Affair at Styles||Hercule PoirotArthur HastingsChief Inspector Japp |- |1922||The Secret Adversary||Tommy and Tuppence |- |1923||The Murder on the Links||Hercule PoirotArthur Hastings |- |1924||The Man in the Brown Suit||Anne BeddingfeldColonel Race |- |1925||The Secret of Chimneys||Anthony CadeSuperintendent Battle |- |1926||The Murder of Roger Ackroyd||Hercule Poirot |- |1927||The Big Four||Hercule PoirotArthur HastingsChief Inspector Japp |- |1928||The Mystery of the Blue Train||Hercule Poirot |- |1929||The Seven Dials Mystery||Eileen "Bundle" BrentSuperintendent Battle |- |1930||The Murder at the Vicarage||Miss Marple |- |1931||The Sittaford Mysteryalso Murder at Hazelmoor||Emily TrefusisInspector Narracott |- |1932||Peril at End House||Hercule PoirotArthur HastingsChief Inspector Japp |- |1933||Lord Edgware Diesalso Thirteen at Dinner||Hercule PoirotArthur HastingsChief Inspector Japp |- |1934||Murder on the Orient Expressalso Murder in the Calais... |