Amina Tong, a student of the Faculty of Higher Mathematics and Cybernetics at Moscow State University, who came to study from Ulan-Ude, was found dead. All information from her computer disappeared without a trace. In the course of the investigation, it turns out that the girl, together with her classmate Yura, developed a program to predict the results of races on the races, and together with another student she played in a casino using her own system for calculating the probability of winning. The fact that, shortly before the death of Amina, Yuri sold the program to a certain Kirill, a daring gambler who attracts talented students to work on hacking and adjusting the list of results of races, comes up.