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While renovating her new apartment in an old Victorian mansion, Quincy's girlfriend Jenny Drake (Marj Dusay) unearths the mummified remains of two women. Later on, two other female corpses are found within the same walls. After a thorough examination, Quincy (Jack Klugman) concludes that three of the women died of natural causes--but that the fourth was murdered. Our hero's subseqent fact-finding misison brings him in close contact with the truly bizarre residents of the crumbling old mansion (and any resemblance to Hitchcock's Psycho is undoubtedly purely intentional).