Brisingr - Christopher Paolini (Book 3 of the Inheritance Cycle)

More awaits Eragon and Saphira following the colossal battle against the Empire's warriors.

He's bound by promises he may not be able to keep, including his oath to his cousin Roran to rescue his beloved Katrina. When unrest claims the rebels and danger strikes, Eragon must make choices that take him across the Empire and beyond. Choices that may lead to unimagined sacrifice.