Mind the Gap (novel)

The book tells the story of Jazz, a teenage girl whose mother is murdered. Her mother's last message, written in her own blood, says "Jazz hide forever." So Jazz runs away from the mysterious Uncles who have both protected and terrified her mother. She ends up hiding in the London Underground, where she joins up with a group of runaways known as the United Kingdom. As she spends more time there, she learns that everything is connected and begins to uncover the secrets around her life and the death of her father.