As the Blood Moon approaches, vampire physician Silas loses royal protection and the suppressants that keep his instincts controlled. To survive, he hires Ronan, a poor but powerful Alpha werewolf, and enters a ten-night Blood Moon contract with him. What begins as a bargain of money and survival soon uncovers Silas’s trauma from a forced mark, Crown Prince Damian’s control, buried secrets of the northern royal family, and a conspiracy between two courts. After five years apart, Silas and Ronan reunite with a child, a crown, and unfinished truths between them, fighting to reclaim the right to choose each other.