The House of Hades is a book about teamwork and sacrifices. Two characters have fallen into Tartarus. A world of hunger, despair, and death. They both have to find their way through Tartarus together in order to save their friends and family, plus the world itself. You might not believe this, but the person behind all of this is Gaea. Or as you might know her, Mother Earth. On the other side, the rest of the team is above ground, finding their way to Epirus, Greece, in order to stop monsters from returning from Tartarus, by closing the Doors of Death. But this is only half of their quest, a half that leads to the success, or end, of the world as we know it. There’s a very high chance they won’t succeed, but the seven demigods have accepted the challenge and they can’t go back now.