In the icy forest near the Arctic Circle, there lives a pair of ordinary but extraordinary father and daughter. Father Eric Heller (Eric Bana) was an agent employed by the CIA. He was active in Eastern Europe and Central Asia in the 1990s and has rich experience. However, for some reason, he finally took his daughter Hannah to live in seclusion in this cold place where humans rarely go. After more than ten years of hard training, Hannah (Saoirse Ronan) finally grew into a combat girl with extensive knowledge and excellent skills. One day, Hannah, who thought she was ready, pressed her father's signal transmitter, and soon the United States received the news. Eric's contact at the time, Marissa (Cate Blanchett), claimed that this agent who had disappeared for many years had a very sensitive secret, so under her auspices, an unpredictable roundup was launched immediately. Hannah has also thrown her weak body into the bloody battle...