In 1908, in the territory of Eastern Siberia, in the area of the small river Podkamennaya Tunguska, a deafening explosion occurred, which could be compared with the power of an atomic bomb. Its strength was such that within a radius of more than two thousand kilometers, centuries-old trees were felled and all living things were destroyed. Scientists are still arguing about what actually fell in the taiga... To get rid of her former partner Rustam, Masha Rusakova agrees to all his conditions and exchanges her apartment. Rustam gets good housing in a new house, and Masha is forced to go to a small apartment that previously belonged to a strange old woman. From the very first day in her new place, Masha begins to be pursued by various people, trying to get into her home by any means. And soon in the attic Masha finds an old chest, and in it an iron object that most closely resembles an ancient amulet. Taking it in her hands, the girl cannot believe her own eyes...