When the CIA's most valuable Russian assets start disappearing one by one, the Agency starts hunting for the mole who's been betraying them since 1985. As the mole hunters zero in on a trusted colleague, the FBI takes over the investigation in hopes of catching the culprit before more damage is done. Former FBI Special Agent Barry Colvert, former CIA officer Sandy Grimes and former FBI Supervisory Special Agent Dell Spry recount to fellow agent Cindy Coppola the agonizing search for the deadliest traitor in American history.