The House of Hades Holds the Key; To Destroying the World and Restoring Peace. Percy and Annabeth have been casted into the darkest parts of the Underworld to do the unimaginable. Meanwhile, their friends have to sail to Greece to close the mortal side of The Doors of Death. But the real leader of this quest isn't even part of the Prophecy of Seven... It's Nico di Angelo. Complete!