by Rick Riordan
First published 2025
Nico, Will, and Hazel are tasked with managing a delicate situation at Camp Jupiter: monsters from the Underworld have taken refuge there, seeking asylum. But soon, these monsters start disappearing one by one, victims of a mysterious and vengeful force. As they investigate, the trio realizes they're all connected to this dark power that seeks to punish the monsters for their past sins. Can they stop this force before it's too late?
Genres: adventure, mystery, fantasy, young-adult
Vibes: atmospheric, fast-paced, suspenseful
Tropes: found-family, investigation
Setting: Camp Jupiter (California - USA)
400 pages · Paperback · PENGUIN