Years ago I saw a couple scenes from an old black and white movie. In one scene there was a blond woman standing at a mirror in her bedroom, getting ready to go out. A cloaked figure comes up behind her and stabs her. She screams and falls dead. Later another blond lady stands at the mirror for some other reason. The cloaked figure comes back, but someone stops him from stabbing her. That's all I can remember because I didn't watch the rest of the movie. Can you help me?