The Forest Queen by E.M. Scott

Without a Forest Queen to protect the Eastern Valley, The Three Valleys are in grave danger. Lola, having escaped from the Serpent Lord's realm, has hidden their most precious treasure in the mountain to keep it safe. This mountain contains the heart of a dragon. Yet Lola's connection with Umir, the boy who writes of her day and night, still remains, which means the Serpent Lord's General has learned of this treasure and is sure to invade. Will a new Forest Queen be chosen before he attacks? And what of the howls of the wolves telling of Lola's faithful friend Oskar? Does he have a part to play in protecting The Three Valleys? Join Lola and her friends as they bravely challenge the Serpent Lord's armies, and discover who will keep the balance of the forest and the underworld, for the next one thousand years.