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New York Times #1 best-selling authors Rick Riordan and Mark Oshiro collaborate again on a new adventure in which Nico di Angelo teams up with his half-sister Hazel Levesque to protect . . . monsters?

A few months after returning from the depths of Tartarus, demigods Nico di Angelo and Will Solace agree to join Nico's half-sister Hazel Levesque at Camp Jupiter on the West Coast. She needs their help in managing a situation that the boys inadvertently brought about: the demigods showed the monsters of the Underworld that they have options; they don’t have to be evil.

Now some of those monsters have taken up residence at Camp Jupiter to seek refuge. Nico and Will are on site assisting Hazel when one by one monsters start disappearing from camp. A mysterious dark force is at work, and its plan is to punish all monsters for their past crimes.

Things only get worse when Nico, Will, and Hazel learn that they’re all connected to it . . .

Rick Riordan (he/him) is the author of five #1 New York Times best-selling series based on mythology, including three that feature the character Nico di Angelo. His most recent novels are Percy Jackson and the Olympians: THE CHALICE OF THE GODS and WRATH OF THE TRIPLE GODDESS. He lives in Boston with his wife, Becky. Follow his news at RickRiordan.com.

Mark Oshiro (they/them) is the New York Times #1 bestselling, award-winning Latinx queer author of the YA novels Anger Is a Gift, Each of Us a Desert, and Into the Light, as well as middle grade books The Insiders, You Only Live Once, David Bravo, and Star Wars Hunters: Battle for the Arena. They are the coauthor (with Rick Riordan) of The Sun and the Star: A Nico Di Angelo Adventure. When not writing, they are trying to pet every dog in the world. Mark lives in Atlanta, Georgia. Follow them on Instagram @markdoesstuff.