Participants in a psychological experiment set out on a journey to solve a real murder. The big game has begun: each of the seven will play their role in the script of Professor Tronov, who came up with this criminal charade. Dreamy, cowardly, envious, desperate, different from each other, like the heroes of a children's rhyme - they are just people who have to beat other people's rules. And do something even more difficult - defeat yourself.