Robert Philip Hansen thought he was smarter than the system. For decades, the quirky but respected counterintelligence expert, religious family man, and father of six, sold top-secret information to agents of the Soviet Union and Russia. A self-taught computer expert, Hansen often encrypted his stolen files on wafer-thin disks. The data-some 6000 pages of highly classified documents-revealed precious nuclear secrets, outlined American espionage initiatives,...

When Eric O'Neill is promoted from a low-level surveillance job into the headquarters of the FBI, his dream of becoming a full-fledged agent is on the verge of reality. He is hand picked to work for the renowned operative Robert Hanssen within "information assurance," a new division created to protect all classified FBI intelligence. Eric quickly discovers the true reason for his hire: Hanssen is the sole subject of a long-term, top-secret investigation,...

"A cybersecurity expert and former FBI "ghost" tells the thrilling story of how he helped take down notorious FBI mole Robert Hanssen, the first Russian cyber spy. Eric O'Neill was only twenty-six when he was tapped for the case of a lifetime: a one-on-one undercover investigation of the FBI's top target, a man suspected of spying for the Russians for nearly two decades, giving up nuclear secrets, compromising intelligence, and betraying US assets....