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A couple discovers mummified remains in the walls of their new home. A developmentally disabled man kidnaps women to act maternal towards him after his grandparents died. His grandparents did the same thing, seeking a substitute for their teen daughter who tried to run away with her baby, kidnapping young women and murdering them when they had outlived their resemblance to their daughter as they grew older.Tropes
- And I Must Scream: The UnSub, being the mentally disabled grandson of the original UnSub, doesn't quite grasp the killing part of his grandparents' disposal method, and tries to mummify a victim while she's still alive.
- Arson, Murder, and Jaywalking: Inverted. When asking herself what the Elgins like to hide, Tara replies: jewelry, keychains… bodies.
- Manchild: The UnSub wants his victims to sing him "Hush little baby" and feed him pretending the spoon is a plane.
- Wham Line: In the opening, when the sheriff notices how the cadaver dog seems confused.Rossi: The dog's not confused, it's overwhelmed.
