รายละเอียด(อย่างย่อ) The Doctor and Clara, with their friend Rigsy, find themselves in an alien world, hidden on a street in the heart of London. On that street are some of the most frightening beings imaginable, and Ashildr! There is death in the air, and not all the visitors will get out alive. A story based on the original script by Sarah Dollard ; retold by Nancy Taylor.