Billy thinks he is just a typical teenager until his abnormally hot breath accidentally sets off the fire sprinklers in the school bathroom, prompting his parents to reveal a long-kept secret: Billy is actually part dragon. Shortly after, a new girl, Bonnie, arrives at school with her own secret. Unsure of who else to trust, Billy and Bonnie team up to discover their part in an Arthurian legend that started with their parents over a millennium ago....

Billy and Bonnie attempt to free a group of prisoners from a realm of evil that consists of seven circular planes of existence.