Beth is only sixteen, but she has already known the bitterness of loss, alienation and betrayal. All she has left is a city at night, the walls of which she covers with countless graffiti. But suddenly Beth learns that there is another, secret London: a city of ghostly trains and arrogant reflections, wandering statues and dancing Lamp People, a city of Women in the Walls and a young ragamuffin God. A city abandoned by the Goddess of the Streets and in desperate need of her. A city devoured by a steel monster whose name is Vys. It is in this city that Beth will have to find her place, her love... and her war.