A version of a story about four youngsters who become heroes in the Russian Civil War. Danka, orphaned son of a Red Army agent, whose father was tortured and executed by the warlord Lyuty before his eyes, and his sister Ksanka join Valerka, a former schoolboy, and Yashka, a devil-may-care gypsy. They make a pledge of mutual assistance, determined to exact revenge on the bandits who are bringing so much suffering to peaceful villagers. The friends then embark on a series of daring adventures.