Dial M for Murder is a staged play adapted to film, which one can pick up due to the dialogue and location(s). The majority of the film, minus the party and stylized courtroom scene, takes place in the flat of a married couple, each who is hiding something from the other.
Ray Milland blackmails an old college acquaintance into murdering his wife, since she is secretly having an affair with a friend. Ray tries to twist this around on her by crafting the “perfect murder.” Everything goes array as his wife accidentally kills the murderer, and all sorts of loopholes start to develop in his master plan, which quickly takes a turn for the worse at the end for him. This movie was released in 3D, but I only watched the standard version. Still, the cinematography was excellent, even if it was staged in mind for the 3D effect.
At least everyone got to settle down over a nice glass of scotch at the end.