For 15 years, government worker Robert Hanssen passed along to the Soviets over 6000 pages of top secret and classified information, including information on the US investigation of smuggling nuclear weapons to third world countries and the entire plan for the continuity of the US government if suddenly attacked. This is the story behind the man who betrayed his country. The book is based on investigative interviews conducted by Lawrence Schiller and Norman Mailer with members of Robert Hanssen's immediate family, his friends, co-workers, past and present Special Agents of the FBI, former agents of the KGB and SUV organs of the Soviet Union and Russian government, diplomats of the Soviet Union, and past and present members of the Catholic Church and Opus Dei.