Toшику and Vika were sixteen and six years old respectively when their parents disappeared. It turned out that their father is a hunter for the нечисть (unclean things), and their mother is a guide to the world of the dead. They decided to begin a new life, but now they have to go to the City of the Sleeping to find their parents. They must be careful, because the Forgotten Beast is coming after them. The question is whether the brother and sister will have enough courage and strength to complete their mission.