David Suchet returns to MASTERPIECE Mystery! in his signature role as suave Belgian super-sleuth Hercule Poirot, with two all-new mysteries based on the novels by Agatha Christie. As the world stands on the brink of World War II in The Big Four (July 27), a grisly, ingeniously devised murder at a grand "Peace Party" reception reunites Hercule Poirot with old friends. Adapted by Mark Gatiss (Sherlock). In Dead Man's Folly (August 3), a fiendishly complicated murder mystery weekend prepared by famous mystery writer Ariadne Oliver (Zoë Wanamaker) at a country retreat takes a tragic turn when an actual murder occurs. Dead Man's Folly was filmed partly on location at the legendary crime writer Agatha Christie's beloved holiday home, Greenway.