The Whole Truth

Lewis Paulton, film producer, and his wife Brenda are having actress Marion Gray and their friend Tony Hart over for dinner.  They go upstairs to change. There is a ring at the door and the maid lets in Hugh Carliss. Carliss picks up a letter opener and puts it in his pocket. When Lewis comes down Carliss identifies himself as a police officer. He says that Marion Gray has been murdered and Lewis was the last one to see her...