The battle was only the beginning; the real danger is beyond the fence ... The Diggers have been destroyed, a horde of ghouls is moving inland and the High Priestess has seized control of the Central Territory. Together with Nim, a Nomad boy seeking vengeance against the ghouls, Squid and Lynn begin their long journey toward the city of Big Smoke, a city that may not even exist. Pursued by forces that wish to see them fail, facing threats on all sides and conflict from within, Squid, Lynn and Nim search for a weapon against the ghouls. It is a search that will lead them into forbidden lands where long-held beliefs about their world are tested and Squid may finally unravel the truth of his identity. But even if they survive their journey, the teenagers on whom the fate of the Territory now rests have no idea what dangers await them beyond the fence.