An American businessman travelling on the Orient Express from Istanbul to Paris tries to hire Hercule Poirot to be his bodyguard as he has had death threats made against him. The sleuth refuses, but wakes up the following morning to learn the man has been stabbed to death while the train was held up by heavy snow - and there is no shortage of suspects among the passengers. Agatha Christie mystery, directed by and starring Kenneth Branagh, with Daisy Ridley, Derek Jacobi and Johnny Depp