The true story of the sequence of events that led to the arrest of Robert Hanssen for espionage in 2001. Hanssen (played by Chris Cooper) was a senior agent at the FBI. An agent-in-training, Eric O'Neill (Ryan Phillippe), is hired as Hanssen's assistant, in order to keep tabs on him. O'Neil is initially not told of the true nature of the investigation. Once he finds out, however, the layers of deception increase and he soon finds himself in danger.—grantss