After spending the last few months wandering around London—a city filled with the dead—B Smith has given up hope for any sign of normal human existence. But then B finds strange signs all over the city—a "Z" plus red arrows. Following them, B finds The Angels— a group gathered in the hopes of combating the evil dead and the forces that introduced them. But all is not as it seems and it's up to B to find out: what battle are they truly waging?