La Mujer Y La Bestia (1959)

aka: The Woman And The Beast

Laura (Ana Luisa Peluffo) is a beautiful young nurse romantically involved with a doctor (Carlos Cores) who is willing to marry her. She accepts to marry him after her sister is cured of a mental illness. But the truth is Laura has no sister. Laura’s plea for her sick sister is really a subconscious plea for herself. The split personality turns Laura into a murderess seeking vengeance for the death of her son. Also with Ruben Rojo, Andres Soler and Fanny Schiller. (In Spanish language).