A young artist suffers from nightmares and turns to a psychotherapist for help. He is troubled by a terrifying dream in which he witnesses a murder. To learn the details, the doctor puts the patient into a hypnotic trance and identifies the presumed crime scene – Moscow’s Tsaritsyno Park. Soon, the body of the victim in a shaman’s costume is indeed discovered beneath a bridge in the park: he turns out to be a Sami student at the Faculty of History. He was killed with an unusual ritual knife. The complicated case is assigned to the talented detective Nastya Vyazemskaya.