Lemon Drops and Dopplegangers. The Dark Mirror is directed by Robert Siodmak and adapted to screenplay by Nunnally Johnson from a story by Vladimir Pozner. It stars Olivia de Havilland, Lew Ayres, Thomas Mitchell, Richard Long and Charles Evans. Music is by Dimitri Tiomkin and cinematography by Milton Krasner. A man appears to have been murdered by one of the identical twin Collins sisters, but both of whom have an alibi. The police and the psychiatrist have their work cut out... Straight out of the corner of postwar Hollywood that began to take fascination with mental illness, The...