Amazon.com description: Product Description: Now that Soren has been reunited with his sister, Eglantine, he must face his next challenge: making sense of the mysterious disappearance of his mentor, Ezylryb. When Soren discovers that Ezylryb is in danger, he and his friends Gylfie, Twilight, and Digger devise a plan to save their teacher. In this process, Soren fights a ferocious foe who wears a terrifying metal beak, sharpened for battle. It's not until the confrontation is over that Soren discovers the true identity of his opponent...

Guardians of Ga'Hoole is a classic in the making -- Kathryn Lasky brings a thrilling new owl world to life. A key theme in the series is friendship: Soren and Gylfie's bond is at the heart of the story. The struggle between good and evil is evergreen and infinitely interesting. This is great series for both boys and girls alike.