He did not know if his powers could save him until the horses' hooves had crushed his ribs and his heart had stopped beating. After that, it was obvious.

1880's France: the corrupt world of the Third Republic. A clandestine brotherhood is engaged in a desperate internal power struggle; a race of beings seeks to free itself from perpetual oppression; and a rip in time threatens an entire city. The future of Europe is at stake, in a war fought with minds and bodies altered to the limits of human evolution.

Chris finds himself working undercover with a suspicious French gendarme; Roz follows a psychic artist whose talents are attracting the attention of mysterious forces; and the Doctor befriends a shape-shifting member of a terrifying family. And, at the heart of it all, a dark and disturbing injustice is being perpetrated. Only an end to the secret war, and the salvation of an entire race, can prevent Paris from being utterly destroyed.