Court of the Dead: A Nico di Angelo Adventure, The

After returning from Tartarus, Nico di Angelo and Will Solace travel to Camp Jupiter to help Nico’s half-sister, Hazel Levesque. Monsters from the Underworld have come there seeking safety after learning they need not remain evil. When the residents begin vanishing, Nico, Will, and Hazel confront an unknown dark power that is targeting the monsters over their earlier deeds. As they investigate the disappearances, the three demigods discover that each of them has a connection to the threat.