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Helen Clarvoe (Joan Hackett) informs her lawyer, Paul Blackshear (Kevin McCarthy), that she has been the victim of threatening phone calls. Helen insists that her tormentor is Dorothy Johnson (Kathy Nolan), the embittered former fiancée of Helen's brother. Using evidence provided by Helen, Paul concludes that Dorothy is indeed dangerous -- in fact, she might even be a murderer. Then comes another phone call: it's Helen again, this time informing Paul that Dorothy is holding her captive in her own home. Based on a novel by Margaret Millar, this episode is capped by a marvelous twist ending that might have worked even better had The Alfred Hitchcock Hour been a radio show.