Among the rush-hour crowds and abandoned levels of the London Underground, someone is pushing women under trains. In his search for the killer, Casimir, a Tube worker, is led ever deeper into this city beneath the city.Below the bright crowds and tunnel musicians is a labyrinth of long-forgotten cross-passages, deep shelters and derelict Victorian stations. Hunting for clues that will lead him to the killer, Casimir is also drawn back into his own past and the terrible secrets of his Polish childhood. In subterranean London, Casimir has gone to ground. But in his desperate search he discovers a chance for forgiveness and the emergence of a new life.Underground is a compelling, intensely atmospheric first novel. It confirms Tobias Hill as an author who, in the words of the Observer, 'writes the kind of fiction that can change the way you look at the world'.