Twelve-year-old Zak, who has an inoperable brain tumour, is with his sister and parents when their private plane is disastrously diverted. Wrecked on a remote research outpost in the Antarctic, they find themselves in an abandoned base. Then Zak's parents disappear, and the base's equipment starts 3D-printing nightmarish spiderlike creatures. Zak's bizarre visions appear to suggest a link to something else - beneath the ice - which only he can understand...