Lieutenant Pyotr Labunsky, a former officer of the Life Guards Uhlan Regiment, in the spring of 1918 joins the brigade of Russian volunteers of Colonel Drozdovsky. As part of the 1st officer infantry regiment, he takes part in the battles for Rostov and Novocherkassk. Lieutenant Labunsky and his comrades, Captain Stern and Lieutenant Vasiliev, after the capture of Yekaterinodar by the Volunteer Army, carry out a number of important tasks in the rear of the Reds. The adventures of the heroes unfold against the backdrop of one of the main stages of the Civil War in the South of Russia...