Renowned sleuth Hercule Poirot finds himself in the first class carriage of the Orient Express, due from Istanbul to London. In torrid and icy weather, the train gets derailed, after which he discovers that Ratchett (Johnny Depp), an indecorous art wheeler dealer who was travelling on the carriage, has been murdered, by 12 stab wounds, spread indiscriminately around the body.
In isolating the suspects to the cohort of first class passengers, he interviews each of them to find out whodunnit. However, each person he speaks to happens to be, rather inconveniently, being imprecise with the truth.
I like how Kenneth Branagh's gone for the pretence of wanting alphabetical billing, yet conveniently abandoned that idea when it comes to Lucy Boynton. I wonder why?