Eric O'Neill, a young FBI employee, is tasked with going undercover as a clerk for Robert Hanssen, a senior agent suspected of having a hidden sexual deviance. Officially, Hanssen has been recalled to FBI headquarters to lead a new division focused on Information Assurance. Initially, the relationship between O'Neill and Hanssen is strictly formal; Hanssen expresses his disdain for the FBI's bureaucracy and criticizes the agency for favoring those who "shoot guns" over individuals who deal with critical national security issues. He frequently voices his frustrations about the outdated information technology systems and the lack of cooperation with other intelligence services.
As time passes, Hanssen becomes more than just a superior; he takes on the role of a friend and mentor for O'Neill, even showing interest in O'Neill's wife, Juliana. However, Juliana is wary of Hanssen and feels uncomfortable with his involvement in their lives. A devout Catholic and a member of Opus Dei, Hanssen encourages O'Neill, who has strayed from his faith, to return to church alongside his secular wife, who hails from East Germany.
Despite his initial suspicions, O'Neill finds no concrete evidence of Hanssen living a double life, leading him to develop a growing respect for his boss. When he brings his concerns to his handler, Kate Burroughs, she reveals that the sexual deviance allegations are merely secondary; the primary concern is that Hanssen has been a spy for both the Soviet Union and Russia for many years, allegedly causing the deaths of multiple U.S. agents. O'Neill discovers that the investigation is being directly overseen by FBI Director Louis Freeh.
The FBI’s focus is to catch Hanssen in the act of espionage rather than arresting him for lesser offenses, aiming to present him with the death penalty for treason and extract valuable information. O'Neill is instructed to retrieve data from Hanssen's Palm Pilot while keeping him occupied, allowing agents to search his vehicle and install listening devices. However, Hanssen begins to suspect that something is amiss when the tracking devices interfere with his car radio, making him question why he has been isolated in his position shortly before retirement. He confides in O'Neill about his fears of being monitored by Russian agents.
When the FBI intercepts a message from Hanssen to his Russian contacts indicating he will cease sharing information, O'Neill reassures Hanssen that he is not being watched, which helps restore Hanssen's confidence. In a final act, Hanssen conducts one more dead drop of sensitive information, and the FBI successfully apprehends him during the transaction.
Despite being promised a promotion, O'Neill feels disheartened by the strain the case has put on his marriage and decides to leave the FBI for a position in the private sector. After notifying Burroughs of his decision, he packs his belongings and is about to exit when he unexpectedly encounters Hanssen, now in handcuffs and flanked by agents. Their eyes lock for a moment, and Hanssen utters the haunting words, > "Pray for me." The elevator doors close, and the scene fades to black.
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