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West Belarus, October 1944. The German command is trying to prevent Soviet troops from entering East Prussia. In order to exclude the leakage of information about their plans, the Nazis use a new code, which is to be solved by Soviet radio operators. This is the task that Major-General Zharov and his subordinates receive. To protect the scouts ordered to a group of Captain Belov, which has already once saved the general from the attack of the German landing force.