In one of the districts of the Kaluga region, in the forest near the village of Demyanovo, a half-alive man with a smashed-in head is discovered. The locals recognize him as Dremyin, a district buyer of supplies/provisions. Apparently, a robbery attack has taken place, since the victim has had a bag with money and receipts stolen. To clarify all the details and motives of the crime, the best investigators of the region are brought in, led by Lieutenant Ulyanov.