Eric O’Neill was a 27-year-old FBI surveillance operative when he first heard the name Robert Hanssen. It was the assignment of a lifetime: go undercover to bring down a mole that had been feeding secrets to the Russian government for more than two decades. O’Neill takes Lindsay behind the scenes...

In 2001, Robert Hanssen’s spy career comes to a crashing halt after he’s arrested in the middle of a handoff to the Russians. It’s a massive win for the FBI, but not without its own fallout. FBI director Louis Freeh still needs to explain to the American public how Hanssen was able to go...