As the oldest of the Callaghan brothers, Daire held his family together when his parents were murdered. With his brothers finally grown, he is able to truly deal with his loss—and his loneliness. But he's out of practice when it comes to dating so he buries himself in his new position as police lieutenant. Parker Li works in internal affairs. Having experienced bad cops, she strives to weed them out. Proud of her Chinese heritage and her mission, she refuses to be intimidated by the hostility she encounters. She has also put her personal life on hold, unwilling to settle down with the guy of her family’s choosing. When Parker stumbles upon the Callaghan file and reopens the case, Daire is, at first, dubious about the sexy dynamo who pushes her way into his office and his life. But while her dedication wins him over, Parker resists the temptation of the steamy lieutenant with the chip on his shoulder. The case is cold, but heat rises as they face the growing desire between them and the danger of solving the murders.