Second only to Wilder's Witness for the Prosecution, this is my favourite Christie adaptation. When executed well, I have an undeniable soft spot for whodunits that I owe to my mum: an itch that Poirot, Branagh aside, rarely fails to scratch.
Ignoring its dubious accents, this is the definition of a star billing. But the real heavy lifting here is done by Dehn's screenplay; his dialogue is deliciously crisp, more than Christie's, imbued with narrative clarity and wit. Murder is…