One girl - could she be the last girl alive? One boy, pursued by reckless men who have kidnapped him from his fathers. Bo and Callum go in search of a safe haven, a place to call home. But where can they turn and who can they trust? When every stranger is a threat, does their only hope lie in reaching Vulture's Gate?Following a journey that takes them across barren deserts and lost valleys, Bo and Callum must discover how to survive alongside runaway boys and crazed religious terrorists, in a world with an uncertain future.And what is the disturbing secret at the ruined city's core?