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, В is for Betty Barnard in Bexhill, С 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...