The body of a graduate student of the Faculty of Law Evgenia Voronkova was found in the park. The girl was strangled, and the crime scene was fenced off with a special tape used by the investigating authorities. The killer left no other traces. From a conversation with a classmate of the deceased, the investigators learn that they helped each other to collect materials for dissertations and often met with the general scientific adviser, Professor Kryuchkov.

The mother of 16-year-old Nadezhda Rusakova announces the rape of her daughter. The girl is constantly confused in the testimony and can not give an accurate description of the attacker, nor indicate the place of the incident. The only clue of the investigation is the rapist's nickname - Yachtsman. The girl's Internet correspondence with him should also help.