Throughout the twentieth century, in the foothills of the Eastern Sayan Mountains, young women fell ill and died under mysterious circumstances. After the death of the German ethnographer Martha Forbeck, her younger sister Christina came to the Soviet Union, where she met Ivan Rektov, whose fate was closely connected with these events. Together they will try to find the mysterious source of evil in the “cursed valley.” This mystical story, which began a hundred years ago, is closely intertwined with the Tofalar tribe, a people living in Eastern Siberia.