Now on Amazon Prime, doesn't feel like Poirot
Mild spoilers.
It's set much later than the original story which was 1936, this version is mid-50's would be my guess. The few and scattered art deco elements appear worn and out of date but modernism hasn't taken hold. If they said I missed it. Poirot is old, his friends are not around, he is no longer a celebrity, is unwelcome at police stations, and then he starts getting letters from a (soon to be) serial murderer. There is also a major change or new element to Poirot's background that doesn't fit with the character or contribute in any way to the story so it's a change for the sake of change. John Malkovich is a fine actor but this take doesn't feel like Poirot, there is only a passing nod to his careful grooming and almost none to his near OCD driven need for perfection. Poirot walks around like a man deep in the throws of depression, which works with changes to the story but not with the character we've come to know. And the mystery itself is rather blase as the killer is somewhat obvious if you consider motive which no one does until Poirot 'surprises' the audience, but that is an equal criticism to the original story.