The Cloud Rider Chronicles - Storm Horizon

Dark clouds are growing on the horizon, threatening to destroy an uneasy peace between the Cloud Rider and Storm Bringer nations. Trapped in the eye of the storm are Alto and Cirrus; two young Cloud Riders of the Taku tribe. A single foolish act forces them to flee across the open skies where they soon find themselves ensnared between Lord Cyclone's Imperial Guardians and the terrifying Storm Bringer warriors. Their only hope for salvation appears in the form of Strata, a young female member of the mysterious Drifter clan. A full-scale invasion is launched, creating a highly charged atmosphere of mistrust and an unexpected threat to the lives of Alto and Cirrus.