After defeating Fathom at the HydroTech Dome, Aluna and her friendsfellow Kampii Hoku; Dash, an Equian born without his horse body and exiled from his herd; and Celli, a winged Aviarset off to warn the desert splinters about Scorch, another one of Karl Strand's clones. But when they arrive in Mirage, the largest Equian city, it seems they may be too late. Scorch has already infiltrated the Red Sky herd and has convinced the High Khan to join Karl Strand. The High Khan is demanding that all of the desert's Equian herds join his alliance with Karl Strand by the time of the Thunder Trials, or risk annihilation. It's up to Aluna and her friends to find a way to defeat Red Skyand Scorchat the Trials before the desert, and possibly the world, are lost to Karl Stand. Here is the action-packed follow-up to Above World, which Kirkus Reviews called "a thrilling sci-fi adventure. Imaginative and riveting."