Cry of the Tiger by Angela Little
Tony Anthony's childhood comes to a sudden end when he is taken to far-off China to learn from a grand master of Kung Fu - his grandfather. Tony's extraordinary upbringing is only the beginning. He goes on to experience adventure and danger as a bodyguard to some of the world's most powerful men. Life is exciting - until there's an unexpected tragedy and everything seems to go wrong. Stuck inside a rat-infested and violent prison, Tony wonders if life's still worth living. Until a stranger comes to visit him...