Hercule Poirot, played by David Suchet, investigates the murder of a Russian chess Master at a summit just ahead of WW2. The PBS show is appearing this Sunday night (July 27) on Masterpiece Theatre.

he Big Four plunges Poirot into a world of global espionage, set against the backdrop of the impending WWII. The public is in a panic after the shocking death of a Russian chess grandmaster at the climax of a high-profile international Peace Party reception. With the help of old friends Captain Hastings, Inspector Japp and Miss Lemon, Poirot must make a dramatic move that only a chess champion could love, while navigating international figures and intrigues in order to identify the culprit.

Adapted by Mark Gatiss (Sherlock), The Big Four reunites David Suchet with Hugh Fraser as sidekick Captain Hastings, Philip Jackson as Inspector Japp, and Pauline Moran as secretary Miss Lemon.
"The Big Four" with H. Poirot