Ash Levine, the tenacious and obsessive detective, resigned from the force just over a year ago when a witness in a homicide case he was working was murdered. But when a legendary ex-cop is murdered in L.A., Ash reluctantly agrees to join the investigation. Hoping his badge will allow him to chase leads on his murdered witness, Ash dives headfirst into the shadow lands of Southern California to investigate the ex-cop's murder. Even once he has a suspect in custody, something still makes Ash uneasy, and unable to let either case go, Ash finds that his obsessive nature might prove fatal as he continues to dig deeper.