Starts Sunday, June 19 at 9 p.m.

Watch Hercule Poirot: Three Act Tragedy Preview on PBS. See more from Masterpiece.

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Poirot (David Suchet) visits his friend Sir Charles Cartwright (Martin Shaw, "Cranford"), who hosts a cocktail party at his home where a local reverend chokes to death. Murder seems impossible, but when a second guest dies under similar circumstances, the Belgian sleuth investigates further. Art Malik ("Upstairs Downstairs") and Kate Ashfield ("Collision") co-star.

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