Once the FBI zeroed in on Robert Hanssen as a suspect, the bureau set up an elaborate sting operation to catch him in the act. A fake promotion, a bugged office, and a daring mission led to an opportunity to finally catch Hanssen red-handed. For 22 years, Hanssen had beaten the FBI at its own game. Now the FBI was ready to strike back. Drop us a line: agentofbetrayal@cbsnews.comSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.