When Katya leaves the orphanage in Batumi learns that she is the daughter of a sailor named Yunus who lives in a conservative neighborhood in Trabzon. Yunus, who had been unaware that he had a daughter.

The head of the Criminal Investigation Department of the Butovo region, Makarov, is completely replaced by the personnel as a result of a conflict with the leadership. Instead of experienced male cops, four young students are singled out.