Postern of Fate is a work of detective fiction by Agatha Christie that was first published in the UK by the Collins Crime Club in October 1973 and in the US by Dodd, Mead and Company later in the same year. The UK edition retailed at £2.00 and the US edition at $6.95.The book features her detectives Tommy and Tuppence Beresford and is the detectives' last appearance. It is the last novel Christie wrote, but not the last to be published as it was followed by two unpublished novels written in the 1940s. The Beresfords are depicted as a retired couple, but they start investigating a cold case dating to World War I. The case involves the poisoning of a female spy. It was her final novel and also one of only four Christie novels not to have received an adaptation of any kind, the others being Death Comes as the End, Destination Unknown, and Passenger to Frankfurt. Source: Wikipedia (en)