The Killing Doll by Ruth Rendell

In a chilling exploration of obsession and delusion, the story follows the lives of siblings, Dolly and Pup, who are ensnared in a web of dark fantasies and misguided beliefs. Dolly, consumed by her desire to become a witch, inadvertently draws her brother into her world of spells and rituals. As Pup becomes increasingly entangled in Dolly's sinister games, his grip on reality begins to slip, leading to a series of tragic events that unravel the fabric of their lives. The narrative delves into the psychological complexities of the characters, revealing the destructive power of unchecked imagination and the haunting consequences of living in a world of illusions.

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