Sarah (Brit Marling) is a former FBI agent who now works for a private security company. However, the company was disturbed by an anarchist organization called "The East", and the company's top management assigned Sarah to be an undercover agent to infiltrate "The East". Sarah, who is intelligent and experienced, quickly mixed into the organization and got along with its members. However, she gradually discovered that in addition to the organization's claimed elimination of violence and robbing the rich to help the poor, there are many unknown mysterious wills. As the penetration into the Eastern organization deepens, Sarah's life and worldview are also quietly changing, and she even has a secret relationship with Benji (Alexander Skarsgård), a member of the organization... Between the new cognition and the tasks behind her, where will Sarah go?