It's the last day on patrol for Tang, as she prepares to move to another precinct as sergeant. But first she wants to tie up some loose ends on the beat. Lydia is pressured to make a decision about the extent of her police duties during the rest of her pregnancy. With Sammy recovering from injuries, Ben and Ferguson are partnered together. But Ben is bent on tracking down the woman he's been trying to help so he can protect her daughter from the abusive pimp controlling their lives.