Hercule Poirot?s tranquil afternoon is ruined when an angry woman accosts him outside his front door. She threatens to report the famous detective to Scotland Yard for falsely accusing her of murder. Seeking sanctuary inside, Poirot is startled to find that he has a visitor ? another stranger claiming to have received a letter from Poirot accusing him of killing the same man. How many more innocent people have been sent letters? If Poirot didn?t send them, who did? And who is Barnabas Pandy, the alleged victim ? is he dead or alive? Poirot has answers to find, and quickly, or more lives may be put in danger?