Confined to the secure unit of a women's prison, Lisbeth Salander finds herself in relative safety. Flodberga is a failing prison and for a computer hacker with her exceptional gifts, there are no boundaries. When Mikael Blomkvist makes his weekly visit, Salander tells him to check out Leo Mannheimer, who is somehow connected to the death of a psychologist and to the psychiatric unit where Lisbeth was an involuntary patient as a child. Lisbeth knows she is coming closer to solving the mysteries of her early life and feels the deadly influence exerted by her twin sister.