Demon’s Heart, Paladin’s Blade

To avenge her family, Duchess Iona cuts her hair and disguises herself as a man, infiltrating the empire's most elite knightly order. By a twist of fate, she is partnered with Zephyr, the strangest boy in the ranks—a "monster" hiding his demonic bloodline. As a cataclysmic war sweeps the kingdom, Zephyr reveals a near-maniacal possessiveness over her, while she struggles in a maelstrom of vengeance, lies, and forbidden emotions.