In the late 1970s, in a large Siberian city, brutal murders of four young women take place. Detectives led by Captain of the Militia Alexey Razin believe it is the work of a serial killer. They work without rest, trying to find the criminal, until Razin notices an unusual fact connected to the past fates of the students. The police put all their efforts into catching the murderer, demonstrating honor and devotion to their dangerous profession.