Tartarus is pissed. Gaea was destroyed a couple weeks ago, now Tartarus wants revenge. The gods, major and minor, Greek and Roman, have all gone missing. It is up to Camp Half-Blood and Camp Jupiter to rescue the gods and save the world, again. There will be new heroes and enemies, and old heroes and enemies, the world is at risk of being consumed by the abyss, because the abyss is waking.