Raised by her father, an ex-CIA agent, in the wilds of Finland, Hanna's upbringing and training have been one and the same, all geared to making her the perfect assassin. The turning point in her adolescence is a sharp one. Sent into the world by her father on a mission, Hanna journeys stealthily across Europe, eluding agents dispatched after her by a ruthless intelligence operative with secrets of her own. Hanna faces startling revelations about her existence.