Lena and the children resurface in an underground lake where they find Ada. Guided by Ilse's spirit, the small group enters the world of the Vrill. Meanwhile, Marta's henchmen, revolted by her extremism and unethical methods, kill her. Refusing to admit that Lena allowed herself and the children to sink into the surface lake, Rafal follows their trail to the underground lake and finds them. However, he can only save the children at the cost of a terrible sacrifice...