To Be a King — Kathryn Lasky

THE LEGENDS
Nachtmagen rages through the N'yrthghar as hag-fiends and traitorous lords conspire to defeat the new king. With Grank and Theo at his side, Hoole must forge an army of free owls strong enough to defeat the forces of darkness massing on the horizon. The power of the one Ember fires the young king's very gizzard and he grows great. But for young Hoole there is a danger much closer than treacherous lords and the poison of half-hags. For magic -- even good magic -- brings great peril to those who would wield it.

So Soren, Coryn, and the Band read the final legend and glimpse what the future may demand of the Guardians of Ga'Hoole.