The story takes place in England in 1933, and the famous detective Poirot (John Markovich John Malkovich) receives an anonymous letter in which the sender predicts three murders and gives clues. Although Poirot called the police, the police did not pay much attention to the anonymous letter. Sure enough, the murder occurred, and the two victims whose names began with "A" and "B" were killed in the manner described in the letter. Poirot knew he had to start a race against time to save the only survivor whose name began with "C". After that, Poirot received several similar anonymous letters one after another, but when he began to investigate the truth behind all these events, he was repeatedly blocked, only Detective Crom (Rupert Grint Rupert Grint) firmly on the side of Detective Poirot.