

New York Times #1 bestselling authors Rick Riordan and Mark Oshiro collaborate again on a new adventure in which demigod 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 . . .
BOOK 1

BOOK 10

BOOK 11

BOOK 12

BOOK 13

BOOK 14

BOOK 15

BOOK 15.5

BOOK 16

BOOK 17

BOOK 18

BOOK 19

BOOK 2

BOOK 20

BOOK 3

BOOK 4

BOOK 4.5

BOOK 5

BOOK 5.1

BOOK 5.2

BOOK 5.2, 5.3, 5.4

BOOK 5.3

BOOK 5.4

BOOK 6

BOOK 7

BOOK 7.5

BOOK 8

BOOK 9

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