On February 18, 2001, Robert Hanssen’s career as an FBI agent came to an end. His next tour of duty would be served in the federal penal system as inmate #48551-083. Supermax, the notorious Colorado prison housing terrorists and drug lords, would become his home for two decades. Life in prison also means death in prison.

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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.

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A Russian businessman arrived in New York in mid-2000, eager to export art to the United States. His counterpart in the deal, an American, appeared ready to do business, too. But neither man was exactly who they purported to be. Their encounter may have been just the break FBI mole hunters were looking for.

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The intelligence community knew it had a mole problem. It couldn’t account for lost assets and blown operations. So the FBI and CIA set out on another mole hunt – and this time, there was one suspect who fit better than the rest. He was a career CIA officer who had been around important cases that went sideways. The FBI tailed him for two years and then squeezed him and his family for almost two more. Just one problem: he wasn’t the mole.

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How did the FBI allow a spy to operate in its midst for more than 20 years and do such devastating damage? Robert Hanssen’s tradecraft was good, but far from perfect. In fact, the FBI missed several chances to nab him.

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Priscilla Sue Galey was a dancer at a strip club about a 15 minute walk from the White House. Robert Hanssen told her that he'd never seen such grace and beauty. He gave her sapphires and diamonds, a Mercedes, a trip around the world. But what did Hanssen want in return? Even more surprising than an FBI agent’s emotional affair with a dancer: the voyeurism in Hanssen's bedroom at home.

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1985 was “The Year of the Spy.” The FBI arrested a raft of traitors spying for the USSR and other foreign governments. But that didn’t stop Robert Hanssen - or his KGB alias “Ramon Garcia.” Hanssen had developed an obsession with espionage and the result would be deadly.

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Robert Hanssen lived in suburbia with six kids and his wife Bonnie. They had a dog, a nice house and went to church on Sundays. Outwardly, it appeared to be an ordinary life. And for the most part, it was. Until Hanssen, an FBI special agent, turned and offered his services to the Soviets.

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Robert Hanssen was a conundrum - an FBI agent and self-proclaimed patriot who became the most damaging spy in the bureau's history. Amid the nuclear threat of the Cold War, America's prized secrets were falling into the hands of its sworn enemy—the Kremlin. The FBI's hunt for the leak led to an astonishing discovery—the mole was one of its own. In this 8-episode limited series, CBS News Chief Washington Correspondent Major Garrett delves into the life of Robert Hanssen and unravels the chilling - and deadly - truth about his many contradictions. Listen to Agent of Betrayal: The Double Life of Robert Hanssen every Thursday, wherever you get your podcasts.