The good spirits of all the herds smile down from among the stars. The dark spirits of all the herds prowl among the shadows. These two forces have reached their end, and a great battle is arising. Two destined horses will lead these spirits in their final battle, with the living herds trapped in between. Following their journey from the first book, Braveheart struggles to find his place in the herd now that Stormfeather is gone. As tensions continue to boil between the good and bad spirits, an ancient and unearthly power is unleashed, with the strength to destroy all of the herds. When Braveheart discovers secrets that could change the course of history forever, he is left to choose between saving the good spirits and the herds... or saving Stomfeather.