The siege / Lasky, Kathryn

"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.

Soren is called upon by the elders of the Great Ga'Hoole Tree to lead a crew of spies into St. Aegolius Academy for Orphaned Owls and escape undetected in order to gain the information the noble owls need to fend off an attack by Kludd and the Pure Ones.