Agatha Christie’s beloved classic novel sets Hercule Poirot on the trail of a serial killer—now a limited streaming series starring John Malkovich, Rupert Grint, and Tara Fitzgerald “Let us see, Mr. Clever Poirot, just how clever you can be.” There’s a serial killer on the loose, working his way through the alphabet, and the whole country is in a state of panic. A is for Mrs. Ascher in Andover, B is for Betty Barnard in Bexhill, C is for Sir Carmichael Clarke in Churston. With each murder, the killer is getting more confident—but leaving a trail of deliberate clues to taunt the proud Hercule Poirot might just prove to be the first, and fatal, mistake.