A terror from the past is rising from the darkness five miles deep. Joining a military rescue mission to an isolated mining colony, the Doctor and Belinda find a single survivor of a violent catastrophe. What killed the colonists? Why is every mirror in the base smashed? The chilling truth spells horror and death. This spinetingling space adventure from Sharma Walfall and Russell T Davies is novelised by award-winning SF and horror writer Gareth L. Powell. It features the Doctor and Belinda as played by Ncuti Gatwa and Varada Sethu.