After spending a year abroad, Lisbeth Salander returns to Sweden. She calls on her court-appointed guardian to remind him, in her own way, of his promise to submit satisfactory reports on her behavior. Mikael Blomkvist continues as a editor of Millenium magazine and they are onto a major story about prostitution and trafficking in women from Eastern Europe. When the investigative journalist working on that story is killed, the police announce that Lisbeth is their prime suspect. Lisbeth and Mikael work independently trying to find who is behind the murders. They not only learn the identity of the culprits but also some of Lisbeth's family secrets.