From IMDB:

When a murder occurs on the train he’s travelling on, celebrated detective Hercule Poirot is recruited to solve the case.

On a British Airways flight I could watch this film with subtitles.

Agatha Christie’s murder mystery is one of her most famous. Because I am now reading that book, I can tell that the film is faithful while still embellishing. For example: the entire first sequence about Poirot solving the theft of a relic is not in the book.

Kenneth Branagh plays Poirot. However, in addition the cast is star-studded:  Penélope Cruz, Johnny Depp, Derek Jacobi, Michelle Pfeiffer, Judi Dench, Willem Dafoe plus many, many other actors.

Magnificent snowy mountain scenes are just another plus. Imagine sitting in a train dining car high on a trestle and not moving because the train has been derailed by an avalanche.  Add to this scene a dead body. What could be more fun?

Worth seeing.