January 1945. In Yalta, preparations are in full swing for the meeting of the leaders of the anti-Hitler coalition: Stalin, Roosevelt and Churchill. Allied intelligence services work together to ensure complete safety of the first persons. They are not in vain that they are worried: a group of saboteurs planning a terrorist attack is really lurking in the city. Counterintelligence officer Turok, local investigator Zhora Makarov and American intelligence major John Wilby are on their trail.