Fire

 According to the author's website, this story takes place thirty-five years before Graceling. Its the companion book to Graceling. The story has different cast of characters, all except for one person who plays pivotal roles in both books. I have read this book recently and it is very good. If you read Fire before Graceling, it might ruin part of it because of the one character in both books. I do recomend this book and say that it will start all scrambled about, then pieces start to come together one by one. Check her website for more info about this book.

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Bitterblue

"Book 3, tentatively titled Bitterblue and currently in progress, is a companion book to both Graceling and Fire and takes place in the seven kingdoms six years after Graceling. As you may have gathered, the protagonist is Bitterblue. Yes, Katsa, Po, and others from Graceling whom I'm not yet willing to name do appear in the book." Cashore, Kristin. "My Books" This Is My Secret: Blog and Website of Kristin Cashore. February 28, 2008. October 19, 2010.<http://kristincashore.blogspot.com/2008/02/my-books.html>