1943 Tehran is preparing for a historic meeting of the heads of the Big Three - Stalin, Roosevelt and Churchill. Hitler orders fascist agents to destroy great politicians. The big game of the special services begins. Soviet intelligence officer Gevork Vartanyan is tasked with identifying and neutralizing the perpetrators of the assassination attempt on the Allied leaders. After a long and extremely difficult work with agents, Gevork manages to get on the trail of an inconspicuous grave digger from an Armenian cemetery. Further investigation of this man leads to the conclusion that he is a German agent, Mayer, who is preparing a plan to infiltrate the British Embassy. It was there that the top three were supposed to gather on the occasion of Winston Churchill's 69th birthday on November 30, 1943. The clock ticked...