Heroes of Olympus: The House of Hades

Hazel looked behind Hecate at the middle gateway. She saw Percy and Annabeth sprawled helplessly before those black-and-silver doors. A massive dark shape, vaguely humanoid, now loomed over them, its foot raised as if to crush Percy. Это и многое другое вы найдете в книге Heroes of Olympus: The House of Hades