One of their own is missing, but Killers don't sleep. As the team divides, can they conquer? Boston Homicide Detective Shane Maguire is overworked with homicide cases and little sleep. When he's called out to the third train murders coming from Maine, he knows it's time to call in the FBI, though he would prefer not to involve them. Agent Mya Morgan has always been a quiet, independent person, who tries to keep the peace in the team, and do what's right. One of their own is missing and she must help them keep a clear head. When a potential serial killer case involving a train is assigned to her, she must leave her team and help Boston. When Mya meets Shane, the reception is cold, despite electricity teasing, but as the investigation heats up so do their feelings. With bodies turning up, can Mya and Shane find a way to conquer, or will the killer get the best of them?