This was a black and white film. There's a scene with a woman in a wheelchair sliding down a staircase. At the bottom her head came off (seen in silhouette). A woman starts screaming for the man to come and save her when the female comes at her with a knife. The killer says that he (the man the other woman is screaming for) is already there. Then she starts taking off her wig, eyelashes, etc., and reveals herself as a man. The movie ends with a voiceover telling the viewer not to reveal the secret. What movie is this?
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