In the final chapter of the great saga of the Guardians of Ga'Hoole, Striga and Nira unite to call upon the terrible forces of the underworld itself. Black magic is returning to the world again. When news of this fateful alliance reaches the Great Tree, the Night Watchers send out a cry throughout the owl world, calling all good creatures under their wing: the colorful kraals, polar bears, green owls of Ambala, puffins, seagulls and wolves from Dali. A huge army of free creatures walks, swims and flies to the Hot Gates of Dali, where the fate of all six owl kingdoms will be finally decided.