Unwinding the Spiral

Avatar the last Airbender meets An ember in the ashes.
Wave has escaped the program for teens called by the wrong god—but her anger at the world has only grown stronger. Set on becoming Heredour's most powerful waterkin, Wave's life implodes when a star crashes to her feet and an ancient curse is reborn.
Jessandra is heir to one of Heredour's many thrones, but she hasn't been called by any of the gods. Terrified that something is wrong with her, she flees her home and her doomed betrothal.
When Wave and Jessandra meet, they forge an unlikely alliance as they try to stay ahead of their enemies. People from all over the country are drawn into their vortex as the lies underpinning their society begin to unravel. When they try to leave Heredour, Jessandra falls prey to the High King's wizards.