Erik Heller (Eric Bana) and his daughter Hanna (Saoirse Ronan) lead a rugged existence in a snow covered forest in Finland. It appears that the father is readying his daughter to endure a life of frigid isolation. He is in fact preparing her for the ordeal her life will inevitably become. Erik is a highly trained CIA agent that has disappeared off the grid. His daughter Hanna, now yearning for independence, wishes to experience the outside world.