Catherine "Cat" Chandler (Kristin Kreuk) is a smart, no-nonsense homicide detective who is haunted by her own tragic past. When she was a teenager, Cat witnessed the murder of her mother at the hands of two gunmen. Cat would have been killed too, but someone - or something - saved her. Nine years later, a case leads her to discover that Vincent Keller (Jay Ryan), a soldier killed in action during military service, is actually alive. As Cat gets to know him, she starts uncovering the mysteries surrounding her mother's murder and just who (and what) Vincent really is.