Ellen Grant and her husband, Steve, live in a brownstone in an older section of New York City. He works the late shift. As they are eating, the conversation turns to the news of a maniacal killer (the Creeper) at large who strangled three women to death in their own homes. Ellen wants a new lock on the front door since she is alone so much at night and afraid. After Steve leaves for work, Ellen calls a hardware store and arranges to have a new lock installed. Throughout the entire day, Ellen is anxious and terrified of everyone she sees. Is the shoe salesman the creeper? Is it the janitor? Or how about her ex-beau Ed, who comes to pay her a surprise visit? Ellen can only hope that the locksmith will come in time to install the lock that will keep her safe.
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