Circles of Seven (Dragons in Our Midst)

Billy and Bonnie have survived their earlier adventures, but now an even more perilous task is before them: navigate the seven planes of existence of a multidimensional domain of evil, each one leading them closer to a powerful enemy, and free the prisoners held in the seventh circle using their dragon skills--and Billy will face the most difficult decision of his life: to continue the quest or turn aside to save Bonnie.