Two years after the woman he loves walked out of his life, Callum Riley, an elite agent at a secret task force, finds his world shattered by her return. Yelena March, a ghost operative with a chaotic past in a syndicate, reappears and demands his partnership for a critical mission. What right did she have to just waltz in like nothing happened? Though still tormented by the pain of her abandonment after their intense five-year history, Callum is forced into an immediate, toxic alliance with his ex-wife. He is eager for revenge, subjecting her to his unresolved anger and bitterness, unaware that Yelena's departure was not a simple betrayal. As the line between their warfare and the mission blurs, Yelena fights through Callum's relentless rejection. He’s furious, guarded, and determined to make her pay for every day she was gone. Yelena came to repair the damage, came to get him back…but she's running on empty. So when the exhaustion of his constant coldness finally breaks her, she begins to withdraw. Callum’s success didn’t feel so victorious now. Did he finally drive her away for good? He is confronted by the terrifying cost of his pride. The tables flipped. It is now his turn to chase and get her back.