Hanna, a teenage girl, has the strength, stamina, and smarts of a soldier. She was raised by her father, a former CIA agent, in the wilds of Sweden. Living a life unlike any other teenager, Hanna's upbringing and training have groomed her to be the perfect assassin. When her father sends her on a mission, Hanna journeys stealthily across Europe while eluding agents who are chasing her, sent by a ruthless female intelligence operative with secrets of her own. As she comes closer to her ultimate target, Hanna faces startling revelations about her existence and unexpected questions about her humanity.