Sara B. Larson’s Defy tells the story of Alex Hollon, the best fighter on the prince’s royal guard. There’s just one catch, however — Alex is actually Alexa; she and her twin brother Marcel lied about her identity so she could join the army after their parents’ death at the hands of an enemy sorcerer. But Alexa’s true identity may not be as well-concealed as she thinks, and she’s not the only one with secrets.