When enraged businessman David Starrling confronts his cheating wife, Celia, he is rendered unconscious by a mysterious figure and wakes up to find Celia murdered. David and Celia's young daughter, Susan, witnessed her mother's death but saw only a shadow and is unaware that the killer is Dell, Celia's scorned sister. Dell -- terrified of discovery -- must now find a way to do away with her own niece before she learns the truth.
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