Soren's Sister Eglantine is falling under the spell of a strange nightly dream. Then just as Soren notices her trancelike state Eglantine disappears. Her dream becomes a deadly walking nightmare that puts the great tree of Ga'Hoole and the evil Pure Ones, deep in the treacherous territory known as the Beaks where a raging forest will prove the greatest danger to the rescuers and their best hope for victory.