Fact-based drama about a high-ranking FBI agent who became the most dangerous security leak in US history. In 2000, surveillance expert Eric O'Neill is assigned to work at the bureau's classified information division under veteran agent Robert Hanssen. However, his real assignment is to gather evidence against Hanssen, who had spent years selling state secrets to the Soviet Union. Starring Chris Cooper, Ryan Phillippe and Laura Linney.

Eric O'Neill, a low-level surveillance expert with the FBI, believes he is accomplishing his dream of becoming a full-fledged agent, with his unexpected promotion and assignment to clerk for Robert Hanssen, a renowned senior agent with 25 years in the FBI. However, he soon learns the reason for his promotion is to gain Hanssen's trust and find proof that he is a traitor to the country. Determined to draw the suspected double-agent out of deep cover, O'Neill finds himself in a lethal game of spy vs. spy, where nothing is as it seems.