Can a person’s consciousness radically change under the influence of a “place of power”? And because of the desire to look into the future? An ancient ruby - could it be a trigger here? Strange visions visit the young girl Agnia, she sees a red stone either in the diadem of a 17th century court lady, or in the hands of a man of ancient India. Otherwise, she dreams of the burnt monastery of the Old Believers - but even there, in the remote taiga, a red stone is invisibly present. The young doctor Philip Vozdvizhensky for the first time in his limited practice encounters such an unusual patient. The doctor consults with his teacher - he had a similar patient many years ago. The professor, in turn, recalls: his teacher told him about a similar phenomenon... All three patients - separated by many decades - saw the same hallucinations, all three had a red ruby in real life, all three visited “places of power”, asked questions about her future - in one case it was a spiritualistic seance, in another - a shaman, in the third - fortune telling on runes. Agnia is tormented by a terrible premonition - and a murder happens. Investigator Marat Kuzmin is leading this criminal case. “No mysticism,” Doctor Vozdvizhensky and investigator Kuzmin decide, “only a scientific approach, only logic and facts!” Will the heroes be able to find a cure for witchcraft in the material world?