Finale to Todd McFarlane's story arc. Traitor in their midst? As Sam ponders why he was chosen to receive messages from the killer, the entire case is about to blow up in his face. Sam and Twitch narrow their pursuit, homing in on a murderer who seems to know too much. Where is this information coming from? The inside? The end comes crashing in as Sam and Twitch attempt to wrap up one of their most exciting and unnerving cases.