In 1986, a chilling revelation sent shockwaves through the FBI’s Soviet counterintelligence section in Washington. Two prized Soviet informants, Valery Martynov and Sergei Motorin, had been compromised. Once exposed, the men were lured back to Moscow, and brutally executed – a bullet in the head for each, the KGB’s grim signature for traitors. The loss of the two agents referred to affectionately within the FBI as ‘M&M’ marked an abrupt end to what had become routine covert meetings and intelligence exchanges.