Guardians of Ga'Hoole Book 12: The Golden Tree
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The Golden Tree is the twelfth book in the Guardians of Ga'hoole series by Kathryn Lasky.
Here is the summary (as is) on http://www.kathrynlasky.com/:
Soren and the Band are back! Coryn has retrieved the ember and it seems a golden age is dawning at the Great Tree. But all that is golden is not necessarily good. Soren, Twilight, Gyfie and Digger face their biggest challenge yet as the young king, haunted by the suspicion that haggish blood flows in his veins, hunts for the truth. His wanderings imperil himself and the good guardians who travel with him.
Meanwhile back at the Great Tree the influence of the ember is strong—and strange. The tree changes, as do the guardians left to govern in the young king’s absence. Otulissa alone objects to the strange new ways and her outspokenness put her in grave danger. Someone must get word to Soren and the Band. But who??