When Y/N, a warm and compassionate Christian care worker, moves next door to Frank Castle, she unknowingly captures the attention of the most dangerous man she has ever met. Frank is determined to keep her away from his violent world, but his attempts to push her away only bring them closer. As their unlikely friendship becomes love, Frank must confront the one thing he fears more than death: losing her. When his enemies discover that Y/N is his greatest weakness, Frank is forced to choose between protecting her by walking away or staying beside the woman who has become his home.