
A devout Catholic who is also a member of Opus Dei, Hanssen urges O'Neill, a lapsed Catholic, and his secular East German-born wife to become active churchgoers. Eventually, Hanssen becomes a friend and mentor to O'Neill and takes a personal interest in him and his wife Juliana, who is suspicious of Hanssen and resents his intrusions. He calls the bureau's information technology systems antiquated and laments the lack of coordination and information exchange with other intelligence agencies. He frequently rails against the bureaucracy of the FBI and complains that only those who regularly "shoot guns" are considered for senior positions instead of those, like himself, who are involved in vital national security matters. Initially, Hanssen insists on a strict formality between the two men. Hanssen has been recalled to FBI headquarters ostensibly to head up a new division specializing in Information Assurance. HuggoĮric O'Neill is a young FBI employee assigned to work undercover as a clerk to Robert Hanssen, a senior agent he is told is suspected of being a sexual deviant. If Hanssen does, it could place both of the O'Neills' lives in danger. O'Neill's work ends up being a game of cat and mouse, it never too clear if Hanssen or he having the upper hand. Things get even more complicated as Hanssen inserts himself and his devoutly Catholic wife Bonnie Hanssen into the O'Neills' private life, Juliana who knows nothing and who intensely dislikes her husband's boss. Having this knowledge makes O'Neill's life more difficult in needing to balance his on-the-surface work to Hanssen and reporting to Burroughs, whose demands on him are greater and greater as he is in the know about the allegations.

Things becomes more complicated when he begins to admire Hanssen and dislike Burroughs the more he is kept in the dark, then learns directly from Burroughs the allegations against Hanssen. O'Neill finds the work difficult, not only because of Hanssen's gruff and uncompromising nature, which includes railing against FBI bureaucracy, but because O'Neill is uncertain what is looking for in observing Hanssen. O'Neill, in accepting the job on the inference that it will help in making agent, is to tell no one, not even his wife, student Juliana O'Neill, formerly of East Germany, of the true nature of his new work. Burroughs tells O'Neill nothing more than that Hanssen is a sexual deviant. The true mission is on Hanssen, with O'Neill to report directly to Burroughs on Hanssen's day-to-day activities.

In February 2001, agent Kate Burroughs recruits O'Neill for a special mission to work as the assistant to twenty-five year veteran agent Robert Hanssen in the newly formed Division of Information Assurance, Hanssen both a Russian and information systems specialist.

O'Neill arguably works harder than most of his colleagues to make agent. Claudio Carvalho, Rio de Janeiro, BrazilįBI trainee Eric M. Eric decides to go on in his assignment despite his friendship with Hanssen and the problems in his marriage. Eric tells his opinion to Kate and she decides to tell the truth about Hanssen to him: he is a mole that sold many secrets to the Soviet Union and has compromised the identity of dozens of agents. Further, his investigation and his relationship with Hanssen and his wife Bonnie affects Eric's wife Juliana. Eric works with the bitter and rough Hanssen and he finds a family man and devout Catholic who earns his respect instead of a deviant. Kate tells Eric to write down the behavior of Hanssen in notes and send them to her since Hanssen would be a pervert under investigation for his sexual behavior. In 2001, the FBI clerk Eric O'Neill, who is a specialist in computers but wants to be an agent, is invited by agent Kate Burroughs to work with the senior agent Robert Hanssen, who had worked for many years in the Soviet Union and now is assigned to protect the agency against electronic infiltration.
