Guardians of Ga'hoole: The Burning
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The Burning is the sixth book in a series called the Guardians of Ga'hoole. Soren, a barn owl, goes to the Northern Kingdoms with his sister, Eglantine, and his friends. All of them are asked to complete different missons, but will they succeed? Will the Great Ga'Hoole Tree fall? To save the tree, they must find allies in the Northern Kingdoms.