The Siege (Guardians of Ga'Hoole #4)

A war breaks out in the owl kingdom when an evil group tries to take control of the Great Ga'Hoole Tree. Soren and the other Ga'Hoolian owls must fight to protect their tree and restore peace. 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. Soren, his friends, and the other owls at the Great Ga'Hoole Tree enter into fierce combat against Kludd's forces. They win a major battle, but warfare will continue in Book #5.

Kathryn Lasky is the Newbery Honor-winning author of over one hundred books for children and young adults. Her beloved Guardians of Ga’Hoole fantasy series has sold more than 4 million copies, and she is the author of the Daughters of the Sea series, the Wolves of the Beyond series, as well as A TIME FOR COURAGE and other Dear America titles. Kathryn has also written a number of critically acclaimed nonfiction titles, such as BEYOND THE BURNING TIME and TRUE NORTH. She lives with her husband in Cambridge, MA.