The First Edition published for the Crime Book Society of the first of Wheatley's 4 "dossiers" in which the reader is invited to solve the mystery from the case files, photographs and evidence presented before opening the sealed section at the rear for the answer. All were undated but subsequent printings were identified on the covers by 50th thousand or some such figure. Here, additionally signed to the rear cover "With Best wishes Dennis Wheatley" quite extensive repairs to the card covers but otherwise good.