Robert Hanssen is a family man, devout Catholic, career FBI agent, and the most damaging spy in American history. Expert interviews recount Hanssen's life, how he stayed hidden for over 20 years, and the events leading to his arrest.

Robert Hanssen is a family man, devout Catholic, and career FBI agent; he is also the most damaging spy in American history. Expert interviews recount Hanssen's life, how he stayed hidden for over 20 years, and the events leading to his arrest.

Robert Hanssen is a contradiction. On the surface he is a family man, devout Catholic, and career FBI agent. Secretly, he is a spy, betraying the trust of everyone he knows. Former FBI agents and journalists recount Hanssen's life, what drew him to espionage, how he stayed hidden in plain sight for over 20 years, and the events that brought down the most damaging spy in American history.