Dead Man's Folly is a work of detective fiction by Agatha Christie, first published in the US by Dodd, Mead and Company in October 1956 and in the UK by the Collins Crime Club on 5 November of the same year. The US edition retailed at $2.95 and the UK edition at twelve shillings and sixpence (12/6). It features Hercule Poirot and Ariadne Oliver. Source: Wikipedia (en)