The film stars Saoirse Ronan as the title character , a girl raised in the wilderness of northern Finland by her father, an ex- CIA operative Eric Bana , who trains her as an assassin. Cate Blanchett is a senior CIA agent who tries to track down and eliminate the girl and her father. The soundtrack was written by The Chemical Brothers. The film received a positive response from most critics, with reviewers praising the performances of Ronan and Blanchett as well as the action sequences and themes. Hanna Heller is a fifteen-year-old girl who lives with her father, Erik Heller, in rural northern Finland , near Kuusamo.