As the Underground is under siege by the Vaun siblings, Autumn and Luke Oaken juggle newfound problems that come with royal elves turning eighteen. The age-old question, "Who will be the next heir?" forces a divide between the twins. On top of the most important decision of their lives, they must join the rest of the Warriors as they fight to keep Arbor Falls safe. But after a deadly attack within their walls, the twins and the rest of the Quinns are sent on a quest to recruit fighters from the other inhabitants of the Underground. Along the way they encounter suspicious merpeople, nerdy vampires, secretive warlocks, and mutinous centaurs. But the magical creatures have been segregated for a reason, though it is not what Autumn originally thought, and the true reason has the potential to destroy countless lives. In the midst of the chaos, Autumn and Avery struggle to keep their relationship secret, while Luke's growing feelings for someone he's always viewed as a friend further complicates the situation. The countless secrets Autumn swears to keep begin to pile up and weigh her down. With this many secrets, one of them is bound to slip...and when it does, Autumn's world as she knows it will come crashing down."
Ash | 
