The Dark Mirror (1946)

A woman suspected of murdering her doctor boyfriend has an identical twin sister. When both twins have an alibi for the night of the murder, a psychiatrist is called in to assist a detective in solving the case. Through a series of tests, he discovers which twin actually committed the crime, and in the course of his investigation he falls in love with one of them.

Robert Siodmak

Nunnally Johnson Vladimir Pozner

Ben Erway Bess Flowers Charles Evans Charles McAvoy Garry Owen Jack Cheatham Jack Gargan Jean Andren Lane Chandler Lela Bliss Lester Allen Lew Ayres Nunnally Johnson Oliver Cross Olivia de Havilland Richard Long Robert Siodmak Rodney Bell Thomas Mitchell Vladimir Pozner William Halligan