After the sudden disappearance of his mom, high school freshman Shay is thrust into a secret world of monsters that exists underneath his small West-Virginian town of Humble Valley. With the help of his shapeshifting aunt Sa'Belle, he must search for his mother while doing what he can to safeguard the citizens of the 'Under Kingdom' and try to maintain his normal high school life. If that wasn't enough, Shay is a strict pacifist in a world that is demanding he go to war to protect it.