Brisingr (The Inheritance Cycle)

Christopher Paolini.

Oaths sworn . . . loyalties tested . . . forces collide... Eragon is the greatest hope to rid the land of tyranny. Can this once simple farm boy unite the rebel forces and defeat the king? Following the colossal battle against the Empire's warriors, Eragon and his dragon, Saphira, have narrowly escaped with their lives. Still, there is more adventure at hand for the Rider and his dragon, as Eragon finds himself bound by a tangle of promises he may not be able to keep.