This is the story of an ambitious professor of psychiatry named Viktor Meshchersky. He conducts a crucial scientific experiment in which, under the pretext of a fictional reason, he decides to lock victims and aggressors in the basement. Soon, it becomes clear what motives drive the scientist. At first, it seems that the characters are not connected to each other in any way. Each victim and aggressor has their own complicated story. However, in the final part of the experiment, all the tangled stories of the participants come together.