Louis has written about Brisingr, or The Seven Promises of Eragon Shadeslayer and Saphira Bjartskular, which is the third book in the Inheritance Cycle by Christopher Paolini. Read more about the world of Eragon here.
The book that changed my life would have to be, Brisingr, the story about Eragon the Dragon rider. This story has changed my life because in my wildest dreams I never thought that I could be part of the medievil antics that were so well done in this book. This book was my dream book come true for me at the time as it included me in this action, and was by far the best book I have ever read.