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After housesitting for a friend, Fran (Elizabeth Baur) begins receiving obscene phone calls at her own home. It doesn't take long for the caller to escalate to death threats--and when a murder occurs nearby, Fran takes it upon herself to find out if there's a link between her unseen tormentor and the killing. Meanwhile, Ironside sets a trap for the murderer...with Fran as bait. This episode was written by Star Trek veteran Margaret Armen.