The ABC Murders (2018-) 
In 1933, retired detective Hercule Poirot is targeted by a taunting killer who sends letters signed "ABC", which Poirot must decode in order to discover the identity of the murderer.
The ABC Murders: Hercule and the new Inspector Season 1, Episode 1
Rupert Grint was the surprise star, here. Malkovich being stilted and precise suits the character of Poirot, but put him together with Crome, they warm up to each other in an organic and compelling way, and it's on Grint's natural talent as a supporting actor. I would watch a series based on Poirot and Crome discussing the weather, so good.