Eloise, sent as a 'substitute bride' in place of her half-sister. The groom, Duke Tristan, is the fierce commander of the victorious nation and a notorious warmonger. She is given the imperial order to seduce him and uncover his weaknesses... However, on the very first night, her true identity is exposed. Just when she thinks death is the only outcome, the duke utters a single phrase. "Get into bed." "Since you've come as a substitute bride, you must continue to play your role." To survive, Eloise accepts a night with the duke. She begins to plunge deeper into pleasures that could cost her life...