A Treacherous Motion (en Inglés) - Deborah Grace White

A princess determined to be won, a prince strangled by duty, a sabotaged magic

In Elowen's world, every movement stirs an invisible gust of magic. But as a princess, she's never been encouraged to study the craft. Her role is to marry for alliance, a necessity she's accepted...mostly. If only the dutiful seriousness of her betrothed didn't blind him to the fact that she still has a heart to be won.

Prince Theodore is used to bearing others' responsibilities, given his older brother's tendency to disappear. He's never yet failed to silence the distraction of emotions and do his duty. So why do both Elowen and the promised alliance feel out of his reach? And why is his failure slowly crushing him?

With the magic of the land tilting steadily out of balance, and a series of disasters threatening the fragile peace between their kingdoms, the pair can't afford to focus on matters of the heart. But they're in greater danger than they know. Only when the threat becomes personal does Theo realize the truth-he'd give anything not to lose the princess he never fully had. Even his heart.