Kaia's been gone for five years, but now she's back and Zinc is on the brink of war. The new "Numbers" program, created by the Tueors' leader, tracks and isolates demigods. Kaia's friend, Catrina, refuses to take part, and that makes her the most dangerous Number of all. It's Kaia's duty to gather and protect the treasures of the gods-which hold their life essence. But neither the treasures nor Catrina are what they appear to be. As the day a dire prophesy foresees draws nearer, will Kaia be able to reverse the gears of fate, or will everything she's ever loved be burned away by the flames of war?