FROM THE WORLD OF PERCY JACKSON. The fourth novel in Rick Riordan's bestselling Heroes of Olympus series - now as a graphic novel!

Lost in the depths of the Underworld, Percy and Annabeth's lives rest in the hands of their friends and fellow demigods - Jason, Piper, Leo, Hazel and Frank.

Unsure if they'll ever see Percy and Annabeth again, the five must put aside their grief and find the mortal side of the Doors of Death to follow Percy's final instructions. The doors must be sealed to stop the giants from wakening Gaea, the primordial goddess. But between them and the door lies a vicious army intent on raising the goddess.

If the demigods can fight their way through the army to seal the door - and Percy and Annabeth can survive the House of Hades long enough - the seven might just be able to stop the destruction of Camp Half-Blood. . . and the whole world with it!

Praise for Rick Riordan:
'Vastly entertaining' Independent
'The stuff of legends' Guardian

Other books and series by Rick Riordan:

The Heroes of Olympus series

The Lost Hero: The Graphic Novel (Heroes of Olympus Book 1)
The Son of Neptune: The Graphic Novel (Heroes of Olympus Book 2)
The Mark of Athena: The Graphic Novel (Heroes of Olympus Book 3)
The Blood of Olympus: The Graphic Novel (Heroes of Olympus Book 5)

The Trials of Apollo series
The Kane Chronicles series
The Magnus Chase Series
The Camp Half-Blood series

RICK RIORDAN(he/him), dubbed "storyteller of the gods" by Publishers Weekly, is the author of five New York Times number one bestselling series with millions of copies sold throughout the world. He is known for his Percy Jackson and the Olympians books, which bring Greek mythology to life for contemporary readers. The first book in the series, The Lightning Thief, has won numerous awards, and been adapted into a feature film, a graphic novel, a Broadway musical and an Emmy Award-winning live-action series on Disney+ that Rick cocreated and executive-produced. He lives in Boston, Massachusetts, with his wife and fellow executive producer, Becky.