Selena, daughter of the Silver Moon Alpha, adopts the identity of Seth to escape an arranged union and enlist in the army. Her fierce rival, Cassius, recognizes her by her scent and crescent-shaped birthmark during moon heat. When Donovan reveals the truth, Selena is sentenced to die—until Cassius secures her fifteen days to conquer the North. Victorious, she becomes the Empire's first female General and rules beside him as he rises to power.