The Dark Mirror

The film is a little bit light, with a bumbling detective played by Thomas Mitchell and vintage Freudian psychoanalysis presented by Lew Ayres, but the twin sister role, one a good girl the other very bad, played by Olivia De Havilland has its moments. Her soft voice can go either direction, sweet and innocent or cold and devious, and the scenes where she is playing both parts, essentially talking to herself, convey a split personality, which might not have been such a bad idea, instead of making two distinct persons. It reaches a zenith in one scene in their dark bedroom with the innocent twin tormented by the mean one, who's telling her to take her sleep medication, and who in fact would like to see her overdose. Freudianism and bungling detective work win out in the end, making this all seem too convenient, and dodging a lot of the possibilities, but the central part, or parts, is DeHavilland at her best.