The Number (Zincian Legend #2)
Kaia disappeared for five years. Now she's back and her planet is on the brink of war. Kaia's friend, Catrina, refuses to take part in the "Numbers" program, and that makes her the most dangerous Number of all. It's Kaia's duty to gather and protect the treasures of the gods. But neither the treasures nor Catrina are what they appear to be.