NEW YORK TIMES bestselling author Tamora Pierce returns to the magical world of Winding Circle. On their way to the first Circle temple in Gyongxi, mages Briar, Rosethorn, and Evvy pay a visit to the emperor's summer palace. Although treated like royalty when they first arrive, the mages soon discover that the emperor plans to invade Gyongxi, posing a fatal threat to the home temple of the Living Circle religion. Accompanied by one of the emperor's prize captives, the three mages rush to Gyongxi to warn its citizens of the impending attack. With the imperials hot on their trail, Briar, Rosethorn, and Evvy must quickly help the country prepare for battle. But even with the help of new allies, will their combined forces be enough to fight the imperial army and win the war?