The investigators from a new police department work on the most complicated cases using special software called "Fillin". Intrigues and unexpected twists make the cops face new challenges every day. In the cases they undertake more and more often are appearing the names of high-ranking police officials. The head of the department, Valentyn Smishko, can't close it down that simple, so he starts overwhelming the investigators with the cases he's sure they'll never solve and will eventually have to abandon their experiment. Thus the old system united to oppose "Fillin".