During the final battle against Galbatorix, the bond between Eragon and Saphira is severed. Panicked and grief-stricken, Saphira flees across the ocean to a new land, hoping to find some way to heal the bond. What she discovers, is a dragon unlike anything she has ever encountered before, a wild dragon with a love of all things precious and valuable, a King Under a Mountain: Smaug.