Underground - The Tube Riders, #1

A gritty dystopian sci-fi thriller from acclaimed author Chris Ward. Marta Banks is a girl with an identity. She is a Tube Rider, a girl who risks death every day in the abandoned underground stations of London. It doesn't matter that her parents are dead. It doesn't matter that her beloved brother has disappeared. It doesn't matter that in the dystopian chaos of London in 2075, in the shadow of the towering perimeter walls, she has no future.
She has her friends. Together, the Tube Riders are a family, united against the brutality of their lives, but when they discover a dark government secret that could bring war to Britain and end decades of oppression, everything they hold dear is threatened. Now they are running for their lives, hunted by genetically engineered killing machines that will stop at nothing to catch them. The Huntsmen are coming..
THE TUBE RIDERS: UNDERGROUND: the acclaimed dystopian thriller set in a near-future dystopian London. Also in this series:ExileRevengeIn the Shadow of LondonGenesis: The Rise of the Governor (prequel)