Son of Neptune by Rick Riordan

Son of Neptune (Heroes of Olympus, 2) by Rick Riordan
Disney * Hyperion
2011
521p.

Demigod Percy Jackson, still with no memory, and his new friends from Camp Jupiter, Hazel and Frank, go on a quest to free Death, but their bigger task is to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled.

Throne of Fire by Rick Riordan

Throne of Fire (The Kane Chronicles, 2) by Rick Riordan
Disney/Hyperion
2011
452p.

Carter Kane and his sister must prevent the chaos snake Apophis from breaking free in a few days' time or the world will come to an end. To have any chance of battling these Forces of Chaos, the Kanes must revive the sun god Ra.

Lost Hero, The by Rick Riordan

The Lost Hero by Rick Riordan

Disney Hyperion Books
2010
557 p.


Summary:  Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself.