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 of the operation that changed his life and led to the capture of one of the most notorious spies in American history. His book of the account is called Gray Day: My Undercover Mission to Expose America's First Cyber Spy. 

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