Michael Caine and a fruity Laurence Olivier play deadly games in a country mansion. The piled-up twists are let down by Caine's inability to completely mask his accent, which is a shame as he had me going for some of it. I reckon the stage production would have been superior. Rated at #203 on the IMDB top-250, as it should be.
The commentary on class/migrant relations/condescension in England circa 1970, when there was some pretension to a new classless society, was a bit pedestrian but articulately delivered. The automata are pretty amazing.
Apparently Caine decided to participate in a remake with Jude Law, using a script by Harold Pinter.