Guardians of Ga'Hoole, Book Four
The Siege (Guardians of Ga'hoole)
by Kathryn Lasky, Pamela Garelick · June 1, 2007

Popularity 56
"Enraged by his clash with Soren and driven by and all-consuming desire for power, Kludd and his group, the Pure Ones, launch an attack upon the Great Ga'Hoole Tree. The noble owls who live there must fight fiercely to protect their resources and defend their honor."--P. 4 cover.
FantasyFictionnyt:series_books=2010-09-05OwlsNew York Times bestsellerJuvenile fictionOwls, fictionTrees, fictionWar, fictionChildren's fictionZhang pian xiao shuoEr tong wen xue