The House of Hades

The House of Hades is the fourth book in The Heroes of Olympus series that is set to be released October 8th, 2013. The book takes place where The Mark of Athena left off. One of the points-of-view that the story is told from is Hazel Levesque.

Development
The title, The House of Hades, refers to the location of the mortal side of the Doors of Death, the House of Hades, an underground temple in Epirus. There will be a few scenes in the book that are in Tartarus. On June 18th, 2013, the audiobook for The Son of Sobek became available and included a preview of the first chapter.

Synopsis
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. But, Leo wonders, if the Doors are sealed, how will Percy and Annabeth be able to escape? They have no choice. If the demigods don't succeed, Gaea's armies will never die. They have no time. In about a month, the Romans will march on Camp Half-Blood. The stakes are higher than ever in this adventure that dives into the depths of Tartarus.

Plot
The Argo II has been relentlessly attacked for two days by rock gods called numina montanum, as Jason Grace called them or ourae in Greek. Leo Valdez defends the ship by firing celestial bronze canons at them. Once his attacks fail, they fly away from the Apennine Mountains. Leo wants to wake Frank Zhang, Piper McLean, and Jason up, but Hazel vetoes his idea because barely any of them have been able to sleep due to the attacks. Hazel blames the attacks on the fact that earth spirits don't like children of Hades/Pluto, as they are children of the Underworld. The trio throw around suggestions of how to get over the Apennine mountains. Hazel prays to her dad to give her a sign of help and in the distance she spots Arion. Hazel then tells Leo to get close enough to the ground where she can talk to Arion.

Main Characters

 * Hazel Levesque
 * Nico di Angelo
 * Leo Valdez

Other Characters

 * Arion

Trivia

 * Rick Riordan said that Nico will not have a point-of-view.