The Bones, Gran'ma Ben, Thorn and an old friend Bartleby venture on a journey through the mysterious ghost circles towards Atheia, the old city of the royal family. Running through waves of destruction, Thorn is hunted down even more than before, and the race aganist time to prevent the Valley from forever becoming a netherworld of ash begins. Meanwhile, an injured Lucius and the villagers work to return to Atheia and reunite with their allies.