Boris works as a medical officer in a private clinic specializing in plastic surgery. When he becomes friendly with one of the patients, Ilya, he discovers that Ilya has been mysteriously placed under the private care of the chief doctor who owns the clinic. During one of their conversations, Ilya hints to Boris that the doctor is running an illegal business from the clinic, but Boris does not take this information seriously until Ilya is found dead the next morning. The doctor declares the cause of death to be an overdose, however, Boris begins to suspect foul play after he is thrown out of the hospital for asking too many questions. As Boris prepares to leave the city, he bumps into Oleg and his friend Katya who are carrying Ilya's body to their car. Convinced that the doctor played a part in Ilya's death and is now trying to cover his tracks, Boris returns to the hospital determined to discover the truth.

On TV a new reality show, "Pionerlager", has started. Following the results of a casting, five young men and five girls, led by young TV presenter Alice Ten, go to the thrown pioneer camp. The rules state that every week someone would be eliminated from the show. The last one remaining will win the main prize: one million roubles. But suddenly game rules change: the invisible observer declares that it is life, not money, that will be the award for the winner. The maniac hiding behind the mask of a horse, begins a hunt for the participants. Children's horror stories which he once listened to in pioneer camp, revive and become a plot of its own murders.