Imperial general Lysandra Vane has posed as an Alpha for ten years, but her heat exposes her as a 3S-class Omega during a decisive battle against the Ironclaw Kingdom. Crown prince Drakon marks and captures her before both armies. As his prisoner, Lysandra uses strategy to resist him, while Drakon discovers that she is his Fated Blade. The enemies become allies, and Lysandra steadily dismantles his control until they stand together to conquer and unite both kingdoms.
