Napoleon Solo, Illya Kuryakin and Gaby Teller have just arrived in Istanbul to complete their next mission: to prevent an assassination that could be a catalyst to a world war. Tensions are high as the team attempts to track down the agents and a mysterious sniper. But what will U.N.C.L.E. do that once the assassins have made them their new targets? Based on Guy Ritche's The Man from U.N.C.L.E.