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The Siege, written by Kathryn Lasky, is the fourth novel in the series entitled Guardians of Ga'hoole.
[edit] Plot summary
Soren's beloved mentor, Ezylryb, is finally back at the Great Ga'Hoole Tree. But all is not well. There's a war between good and evil in the owl kingdom. On one side is a group led by Soren's fearsome brother, Kludd, who wears a terrifying metal mask to cover his battle-scarred face. On the other side are the owls of the Great Ga'Hoole Tree, who must fight to protect their legendary tree from Kludd's attacks. Meanwhile Soren and his friends must penetrate into what they so long escaped from, St Aegolius Academy for Orphaned Owls. They manage to get in then out, but Soren is badly wounded and the Pure ones are about to assault the Great Ga'Hoole tree.