In this exclusive authorized edition from the Queen of Mystery, Hercule Poirot sets out on the trail of a serial killer.?There is no more cunning player of the murder game than Agatha Christie.?? Sunday Times (London)?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.