Fourteen year old Harlie Castleberry moves to Cleveland, Georgia to live with her estranged mother when her father dies. She arrives with an attitude and a chip on each shoulder. Her attitude changes when she discovers the family secret: shapeshifters who change into mountain lions to fight an ancient being not of this world. With the help of distant cousin Tomahawk Billy, Harlie must take a journey of self-discovery to vanquish an evil which has walked this world for centuries.