In 1976, at the height of the Cold War, Robert Hanssen joins the FBI to work in their counterintelligence division. Hanssen is valued for his technical skills, and put in charge of databases containing some of the country’s most valuable secrets. But he’s socially awkward, and constantly passed up for promotions and field work, leaving him resentful of his employers. Soon, he decides to turn to another source of income: selling information to his country’s greatest enemy, the Soviet Union. Over the course of several decades, he’ll become one of the most damaging spies in US history.

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