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 special services begins. Soviet intelligence officer Gevork Vartanyan was instructed to calculate and neutralize the perpetrators of the assassination attempt on the leaders of the Allies. 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 development of this man leads to the conclusion that this is a German agent Mayer, preparing a plan to penetrate the territory of the British embassy. It was there that the three leaders were to gather on the occasion of the 69th anniversary of Winston Churchill on November 30, 1943. The bill went to the clock...