The House of Hades (Heroes of Olympus Book 4) by Rick Riordan

The fourth book in the bestselling spin off series from Percy Jackson and the Olympians - now a major Disney+ series!The stakes have never been higher. If Percy Jackson and Annabeth fail in their quest, there'll be hell on Earth. Literally.

Wandering the deadly realm of Tartarus, every step leads them further into danger. And, if by some miracle they do make it to the Doors of Death, there's a legion of bloodthirsty monsters waiting for them. Meanwhile, Hazel and the crew of the Argo II have a choice: to stop a war or save their friends.

Whichever road they take one thing is certain - in the Underworld, evil is inescapable. Return to the World of Percy Jackson in the best-selling, brand-new adventure featuring the original hero in Percy Jackson and the Olympians: Chalice of the Gods – out now! And don't miss the trio's next adventure in Percy Jackson and the Olympians: Wrath of the Triple Goddess, coming soon!

Paperback
Publication: 2 Oct 2014, Puffin 
ISBN: 9780141339207
Extent: 624 pages