Unravel the Myth of the Diamond Pyramid... Following the formation of the United Worlds, a period of calm ensues for the tri-prophet children. It's a welcome and well-deserved break from fighting evil forces and menacing foes...or so it appears. In Book 5 of this popular series, Tiare and Cora are attending summer school in the Sun world of Rā-and soon learn that even as great warriors, they are no match for immortal teenage nastiness. For the first time in their lives, they find themselves unpopular, unwanted outsiders, and this vulnerability creates an opportunity for fellow student Zabe to gain their trust. But he has a sinister ulterior motive that involves trapping the tri-prophets of power and their friends in the legendary diamond pyramid-an inner world that holds many secrets, including the location of the missing fairmoons. It's only a matter of time before the fate of the fairmoons becomes intertwined with the fate of the tri-prophets and their friends within the diamond pyramid.