When a man is murdered in the alley behind her place, she's dismayed when his spirit appears, too, asking for help. FBI agent Dallas Samson has a passionate interest in the murder, since the victim's a colleague whose death is connected to the smuggling ring known as Los Lobos: the wolves. Unaware that Dallas has certain abilities of his own, Hannah calls her cousin Kelsey O'Brien, a member of the FBI's Krewe of Hunters, an elite unit of paranormal investigators.