He is Heaven's most powerful Seraphim. She is an infernal being whose existence should not be possible. When Vespera arrives at Aethelgard Academy, she expects the fear, the whispers, and the stares. What she doesn't expect is Cassiel—the one celestial she should never have met. Drawn together by forces neither understands, the two soon find themselves caught in the center of an ancient prophecy that threatens to unravel the balance between Heaven and Hell. As kingdoms move against them and old powers awaken, Cassiel and Vespera are forced to make an impossible choice: Obey the worlds that created them. Or choose each other. Even if it means watching everything burn.