Sophia the Flame Sister

When eleven-year-old Gwen ventures beyond her castle home, she discovers the magical island of Avalon. The lady of the lake, Nineve, tasks Gwen and her best friend Flora with rescuing the eight Spell Sisters who have been imprisoned by the evil sorceress Morgana la Fay throughout the kingdom. In this first book, Gwen and Flora must save Sophia the Flame Sister from an enchanted forest and help restore the magic of fire to Avalon.