Children's / Teenage general interest: ancient religions & mythologies

Though the Greek and Roman crew members of the Argo II have made progress in their many quests, they still seem no closer to defeating the earth mother, Gaea. Her giants have risen – all of them – and they’re stronger than ever. The gods, still suffering from multiple personality disorder, are useless. How can a handful of young demigods hope to persevere against Gaea’s army of powerful giants?

The penultimate book in the ‘Heroes of Olympus’ series. The stakes are higher than ever in this adventure that dives into the depths of Tartarus. At the conclusion of ‘The Mark of Athena’, Annabeth and Percy tumble into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy’s instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea’s forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors both sides and prevent the giants from raising Gaea.