Go to
http://search.barnesandnoble.com/books/product.aspx?EAN=9781423140566&cm_mmc=Facebook-_-NOOK-_-Product+Page-_-throne_of_fire#CHP
Look for the link at the left of the page, under the picture of the book cover:
Read a Sample Chapter
or download the first chapter text or audio at http://disney.go.com/disneybooks/kanechronicles/