A mystery featuring Agatha Christie's legendary hero follows Hercule Poirot as he tries to solve a diabolically clever puzzle in 1920s London that will put his keen skills of detection to the test.

While traveling from London to Kingfisher Hill to discretely investigate murder allegations against a wealthy client's wife, Hercule Poirot swaps seats with a nervous train passenger before a second killing is complicated by a series of impossible confessions.