O'Neill tells the thrilling story of how he helped take down notorious FBI mole Robert Hanssen, the first Russian cyber spy. With zero training in face-to-face investigation, O'Neill found himself in the newly formed Information Assurance Section, tasked officially with helping the FBI secure its outdated computer system against hackers and spies-- and unofficially with collecting evidence against his new boss. As his self-esteem and marriage unravel under the pressure of life in Room 9930, as Hanssen outmaneuvers an intelligence community struggling to keep up with the new reality of cybersecurity, he also teaches O'Neill the game of spycraft. -- adapted from jacket