McNally and Swarek help investigate the murder of a suspected rapist and murderer. However upon finding evidence that implicates McNally's father as the culprit, the officers search for proof of his innocence. McNally's father is later cleared, after the wife of the deceased confesses to the murder. Meanwhile, a vigilante accesses police information via Diaz and Epstein's squad car. However upon being caught it is revealed he has vital evidence that helps towards taking down a major drug ring. Also, Peck confides in Nash about the pressure of expectation she feels.