Experiment Perilous
("Noche en el alma" -- ES, "Angoisse" -- FR)

US (1944): Romance/Thriller

In 1903, Dr. Bailey (George Brent) meets a very strange woman on a train, then hears that she has died under mysterious circumstances. Through a friend, he becomes acquainted with the Bederaux family, all of whom seem to be neurotic and secretive; but the beauty of Alida Bederaux (Hedy Lamarr) draws him into their circle... deeper than he'd planned. Who's in danger from whom? Who's crazy? Who can fathom the obscure motivations? Paul Lucas, Albert Dekker and Margaret Wycherly co-star. Directed by Jacques Tourneur for RKO. (IMDb)

 Use this link to view the original theatrical trailer for Experiment Perilous on TCM.com.