The Unready Queen (The Oddmire, Bk. 2) by Ritter, William

Human-raised brothers Tinn and Cole join forces with Fable, daughter of the Queen of the Deep Dark, to stop the fighting between the people of Endsborough and the creatures of the Wild Wood before violence turns into all-out war.

Human and goblin brothers Cole and Tinn are finding their way back to normal after their journey to the heart of the Oddmire. Normal, unfortunately, wants nothing to do with them. Fable, the daughter of the Queen of the Deep Dark, has her first true friends in the brothers. The Queen allows Fable to visit Tinn and Cole as long as she promises to stay quiet and out of sight—concealing herself and her magic from the townspeople of Endsborough.

But when the trio discovers that humans are destroying the Wild Wood and the lives of its creatures for their own dark purposes, Fable cannot stay quiet. As the unspoken truce between the people of Endsborough and the inhabitants of the Wild Wood crumbles, violence escalates, threatening war and bringing Fable’s mother closer to the fulfillment of a deadly prophecy that could leave Fable a most Unready Queen.