User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5850470-20121217235414/@comment-5774152-20121219011902

@PerseusJacksonWaterson: You are forgetting about the fight at the Original Olympus. Closing the Doors of Death doesn't mean they've deafeated Gaea. That will only stop Gaea from letting out more minions into the mortal world. I think that The House of Hades will be mostly about them traveling to the Doors of Death, and at the end the gods will decide if they'll fight side by with them at Olympus. Book 5 will be about the fight at Olympus and the fight between the Greeks and the Romans.