A killer is loose on the streets of Detroit; torturing and mutilating the innocents of Motor City. But are all of its occupants really that innocent? Detective Artie Franco and his team in the Major Case Unit have been assigned to investigate, stop and bring to justice this twilight menace. However the various methods of death that the killer implements, plus the unusual trophies taken from each of the bodies causes a turf war between the local cops and the F.B.I who want nothing more to seize the case and bask in its glory. The case teeters too close to home for Artie and he is temporarily relieved, the obnoxious Special Agent Parker calling the shots and setting out to find the 'profile perfect' killer, ignoring the human puzzle that is the case. Unless a union between the F.B.I and Detroit Major Case Unit can be found, the killer will continue prowling the streets, upping its body count one gruesome murder at a time. Can Artie find common ground for his team and the feds? Can he solve the puzzle surrounding the killer's trophy choice? Can he ultimately stop Detroit's serial killer before his private life collides with his professional life?