The Influence is a novel written by Ramsey Campbell. It was first published in 1988.
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Sometimes evil refuses to die.
Rowan's great-aunt Queenie is dead. After all the misery she caused her family while she was alive, most of them are secretly relieved. But Queenie did not want to die, and she will do anything to live again… including possessing young Rowan. She haunts the child's nightmares, taking her over bit by chilling bit. As her soul is drawn inexorably into a cold darkness, can Rowan hope to reclaim her life from the evil dead?