The new assignment received by FSB Colonel Korsakov seemed simple and, in the opinion of his superiors, was purely formal. The colonel was assigned to check the work of the special unit of the Ministry of Internal Affairs for the fight against Satanism in the city of Sosnovsk. The town surprised Korsakov with its peace and quiet. However, on the very first night it exploded with the roar of gunfire and became red with the glow of fires. It turned out that Sosnovsk was entirely under the rule of the Satanists, and Korsakov had to enter into a cruel, unequal struggle with them alone...