One is indeed left to wonder just how differently Sarah would have turned out if her parents had embraced her regardless of her deformity. Instead, Carol and Mark do everything they can to hide their secret, including by murdering the aforementioned little girl, who learned of Sarah’s existence while trick or treating at the house, and burying her in the backyard. In other words, Sarah wasn’t lying when she told Peter that their parents were absolutely terrible people. But she does trick him into killing them for her, sealing his own fate in the process.
But before Sarah can lock Peter in the same pit that was once her prison, Ms. Devine shows up to save Peter, and they manage to turn the tables on Sarah, locking her in the pit once again. Peter’s nightmare is far from over, though. As the movie ends, Sarah promises Peter that she’ll one day escape her cage and find him. Cut to sometime later: Peter has been adopted by Ms. Devine and now lives happily in her house. That is, until one night when he goes to bed, and finds his sister waiting for him…
In the end, Cobweb is about a cycle of abuse and violence. Carol and Mark abuse and neglect Sarah due to her deformities, which transforms her into a more literal monster that will stalk Peter for the rest of his presumably short life. And during all of this, Peter has also been tricked into committing murder. But as Peter has learned through this traumatic experience, murder runs in the family.
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