Very nice young women - Vera, Nadezhda, Lyubov - came to Crimea to relax. They settle in the Eden Hotel and do not know that according to the devil’s plan, everyone who arrives at this hotel must indulge in sinful pleasures on the seventh day, and on the thirteenth - give their soul to Satan...

The movie takes us back to the times of the Civil War, when the young Soviet power was defended by the first heroes of this terrible internecine war. Red commanders Semyon Budyonny and Kliment Voroshilov managed to gather an entire army of "red cavalrymen" - thus began the history of the campaigns "through valleys and up hills" of the legendary First Cavalry Army.