Yuri Bragin, after a year's business trip, where he, as part of an investigative team, was investigating a high-profile case, returns to St. Petersburg. Returning, he learns that the current head of the First Investigation Department of the First Directorate of the State Investigation Department, Vadim Maltsev, is retiring. With a high degree of probability, it is Bragin who will be offered his place. But Yuri is not a careerist and the place of the boss is not the goal of his life. A talented investigator is more fond of working "in the field". And now he was sent on a business trip again. This time in one of the cities of the Leningrad region, where two girls were killed with a week difference. Here, in a small town, everyone knows each other, and this complicates the search for the offender.