The Son of Neptune (Heroes of Olympus Book 2)

This second book in a bestselling spin-off series from Rick Riordan introduces Percy Jackson as he awakens to new challenges in a world filled with gods and monsters. After encountering dangerous foes and discovering forgotten memories, Percy joins forces with fellow demigods Frank and Hazel on a crucial quest linked to the Prophecy of Seven. Their mission is vital, as failure could threaten not only their world but the fate of the gods and humankind alike.