After Allison is mugged, she decides to take charge by enrolling in self-defense classes. Also, Devalos investigates a teenager's rape and an undercover cop's possible murder, and the suspect may have very close ties to Scanlon.

Scanlon is haunted by dreams of his late brother, leaving Allison concerned about her colleague. Also, while making her final preparations for college, Ariel has visions of missing young women, past and present.

While investigating a missing girl's murder, Allison experiences more friction with Scanlon after finding a possible link to his late brother. Also, Ariel deals with her siblings' reactions to her leaving for college.