"Circle of Magic" is a fantasy book series by Tamora Pierce that follows four young mages: Sandry, Daja, Briar, and Tris. Each character possesses unique magical abilities and comes from different backgrounds. Together, they learn to harness their powers while navigating challenges and forming strong friendships. The series is set in the fictional world of Emelan, where magic is an integral part of life. The story explores themes of friendship, responsibility, and personal growth as the characters face various trials and learn to work together to overcome obstacles.