A widow's sudden suicide sparks rumors that she murdered her first husband, was being blackmailed, and was carrying on a secrey affair with the wealthy Roger Ackroyd. The following evening, Ackroyd is murdered in his locked study, but not before receiving a letter identifying the widow's blackmailer. Kings Abbot is crawling with suspects and it's up to famous detective, Hercule Poirot, to solve the case.