The Divorce of Lady X

Leslie Steele (Merle Oberon), a guest at a costume party is forced to stay overnight in a hotel because of bad weather. As there are no rooms available, the hotel persuades Everard Logan (Laurence Olivier), a handsome but somewhat stiff lawyer, to share his suite with the lady. They spend the night together, quite chastely, but Logan becomes convinced that Leslie must be married. His conviction is confirmed when an old school friend, Lord Mere (Ralph Richardson) arrives and asks Everard to represent him in a divorce case against his wife, Lady Claire. – wikipedia