Ella is fearful of what will happen to Ricky when he testifies against his father, who's on trial for murdering the boy's mother; Temple tries to convince the victim of a serial rapist to testify; Nick discovers some explosive evidence against the mayor.

Temple leads an investigation to catch a serial killer who is murdering prostitutes, but after viewing the women's mutilated bodies he doesn't know if he's strong enough to see the job through; Mannion comes under pressure to hire a politically correct candidate for a district-commander post.

Mannion searches for a vigilante who is killing convicted child molesters; Ella learns that one of her neighbors is a former sex offender.

Mannion attempts to reunite a troubled boy living in foster care with his mother, who is in jail on a drug charge; McGregor tries to prevent a stalker from harming a woman; a female reporter shadows Mannion to write a profile of him; and Temple raises doubts about his upcoming wedding.