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.

Clay has lived his whole life under the mountain. The MudWing dragonet knows war is raging between the dragon tribes in the world outside -- a war that he and four other dragonets are destined to end, according to the mysterious prophecy they have been taught. The five "chosen" dragonets were stolen from their homes while they were still in their eggs -- and hidden away for years -- all to fulfill the prophecy. But not every dragonet wants a destiny....

When Starflight, one of the dragonets of destiny, is kidnapped by the NightWings he finds that the kingdom of his birth is a miserable place, full of terrible secrets--and that, with his fellow dragonets too far away to help, the fate of two kingdoms rests in his talons.