Nun Kalistrata was killed!..There is no other explanation for the sudden death of the young ascetic, according to fellow pilgrims Svetlana Atrazekova and Yulia Shatova, who are starting an investigation. The theft of twenty million rubles from a monastery safe, the “commercial” activities of a hieromonk leading a free social life outside the church, the theft of personal belongings from sisters: the veil of secrets of the “monastery courtyard” is crumbling. In addition, the police render an undeniable verdict - the nun was indeed poisoned, and this is only the first victim in a chain of terrible crimes... However, investigator Sergei Bystrov is convinced: evil penetrated the holy walls from the outside, and an accomplice of a well-coordinated criminal group is operating in the monastery. And she seriously threatens the life of Svetlana - the woman he seems to have been looking for all his life.