Agatha Christie's mustachioed gumshoe, Hercule Poirot (David Suchet), is on the hunt for Mrs. McGinty's killer. Her tenant, James Bentley (Joe Absolom), has been arrested, but the police superintendent (Richard Hope) isn't certain he's guilty. Poirot arrives at the scene to poke holes at the prevailing theory, enlisting a mystery writer friend (Zoë Wanamaker) to confer, just in time for the murderer to decide that Poirot is his next mark.