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Nanny has always taken care of Virgie Fane and is now in charge of her two children. The elder, Joey, is being released after spending 2 years in a home for disturbed children; Joey was placed in the home because of his implication in the drowning of his sister, but he still maintains that Nanny was responsible. Both Virgie and her husband, Bill, are nervous about Joey returning home, especially Virgie, who depends on Nanny to run the house for her. Joey refuses to have anything to do with Nanny, but no one believes his story except Bobby, the girl upstairs. Bill, a diplomatic courier, is called away on business, and Virgie suffers an attack of food poisoning that forces her to enter a hospital. Aunt Pen, an invalid dependent on heart medicine, comes to take care of the children, and she becomes convinced that Joey is telling the truth when she sees Nanny about to smother him with a pillow. Later, Nanny tries unsuccessfully to drown Joey. When Aunt Pen has a heart attack, Nanny withholds her medicine and tells her story to the dying woman: Joey's sister's death had been a preventable accident for which Nanny was responsible; that, plus the death of her own illegitimate daughter, have caused Nanny to go mad. After Aunt Pen dies, Nanny again tries to kill Joey, but she cannot. Joey and his mother are reunited in the hospital, as Nanny is taken away by the authorities.