The play is adapted from Agatha Christie's novel of the same name. In England in 1954, on a train bound for London, Luke Fitzwilliam (David Jonsson) met Miss Pinkerton (Penelope Wilton). Miss Pinkerton said that a serial murder case had occurred in the quiet village of Wedgwood in England, and speculated that the next victim would be a local doctor. Fitzwilliam did not believe her and thought it was just her fantasy. However, a few hours later, Miss Pinkerton died in a car accident, and the vehicle fled after the accident. Is it just a coincidence? Luke tends to think so-until he read the obituary of Dr. Humberby's accidental death in The Times a few days later... Luke must find the real murderer immediately, because for some people, killing is not difficult.