• An ageing Hercule Poirot is contacted by a killer who tours the country by train, leaving a copy of the ABC railway guide at the scene of each murder. As Poirot tries to investigate, he is humiliated by the police and taunted by the “faceless beast” of a murderer.
  • The ABC killer sends more letters promising to spill blood. Hercule's past, integrity and identity come into question while he fights a rising tide of xenophobia.
  • With the ABC killer still on the loose, Hercule realises that only he holds the key to the murders. He faces a race against time to stop the bloodbath.