"Sleuth"

This is one of the best psychological thrillers I've ever watched.


It is one of those "hermetic" stories in which heroes are locked in a room or a house... and the action is not about movements. It is about psychology, interaction, gestures...
The plot is quite intriguing. A famous detective writer invtes his wife's lover to his place (it's quite a matching couple to drink tea together).
They are going to be civilized and discuss divorce.
Will things really be civilized? Or will they get completely insane? Because what is sanity? Does it really exist? Can we really be sure in that? When we, social creatures, are in a social circle... we know what "normal" is, yes, of course, "we do". We do act "normal". But a world of two may be quite the same as the world of one. It is easy to forget what IS real, what ARE the rules people should  play by. A victim and a vulture caught in one room are quite a sight. But sometimes it is so difficult to guess WHO is the vulture. Or is everybody in a room THE dangerous one?