When a newspaper reporter goes missing, the Doctor, Tegan and Nyssa uncover a case of alien abduction. The trail leads them to the planet Luparis, and a city that appears to be a replica of Tudor London. What are the monsters that lurk in the shadows? And what is the terrible secret at the heart of Luparis? To save a world, the Doctor must try and defeat the evil plans of Queen Zafira. And one of her plans is to marry him...