Helden des Olymp, Band 4: Das Haus des Hades

Percy and Annabeth, along with their friends on their ship, the Argo II, have made it to Rome. But now everything is at stake: The Earth Goddess Gaia and her army of giants can only be stopped if they close the Gates of Death from both sides at the same time. Luckily, Percy and Annabeth have already fallen into the Underworld through a chasm, so they can start their search right away. Will they make it in time to prevent the downfall of Olympus?.