The action takes place in early 1945. Preparations are in full swing for a meeting between the three representatives of the anti-Hitler coalition. Stalin, Roosevelt, and Churchill are planning to hold a summit in the Crimean city of Yalta. At the same time, representatives of intelligence agencies learn that an attack is being prepared against the leaders of the three countries. The meeting is at risk of being disrupted and turning into a catastrophe. To prevent the tragedy, it is necessary to find the saboteurs who are plotting the assassination.