In the Hand of the Goddess by Tamora Pierce

[Atheneum Books for Young Readers] Alanna must protect her best friend, the prince, from an evil sorcerer in this second book in Tamora Pierce’s Margaret A. Edwards Award–winning young adult series—now with a new look! Still disguised as a boy, Alanna becomes a squire to none other than the heir to the throne. Prince Jonathan is not only Alanna’s liege lord, but also her best friend—and one of the few who know the secret of her identity. When a vicious sorcerer threatens the prince’s life, it will take all of Alanna’s skill, strength, and magical power to protect him…even at the risk of surrendering her dreams.