When an elderly Cornish vicar suddenly drops dead at a party, everyone looks to fellow guest Hercule Poirot to solve the murder. But the Belgian super-sleuth sees no foul play, correctly predicting that analysis of the clergyman's glass will yield nothing more than the remains of an excellent dry martini.
Poirot is summoned back to England when another death among the same revelers has occurred, this time, indisputably, murder.

With the help of two enthusiastic amateurs —his old friend, the retired stage actor Sir Charles Cartwright, and Charles's jaunty love interest, Miss "Egg" Lytton Gore — Poirot works to unravel a perplexing mystery, building a house of cards, tracking a missing butler, and even hosting his own sherry party.
Watch the full episode. See more Masterpiece.
Sunday at 8 p.m. on PBS-HD.
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