of Hercule Poirot , Miss Marble, Colonel Race, Ariadne Oliver, Tommy Beresford and Tuppence Cowley. This included The Hollow (1946), Taken at the Flood (1948), Crooked House (1949), A Murder is Announced (1950), They Came to Baghdad (1951), Mrs McGinty's Dead (1952) and They Do It with Mirrors (1952).   Agatha Christie