Nate gets a new partner, Raina, after C.D. abruptly leaves the division. Jinny reveals to Magda that she received divorce papers from Jack and ends up chatting up the newest sketch artist.
Magda and Jinny try to find a burglar, who likes to prey on women but keep getting sidelined by a female bounty hunter. Meanwhile, Kate fights to keep her granddaughter after her surrogate mother wants her back.
Internal Affairs begins investigating whether or not Jinny used correct procedure after shooting the man who killed her brother.
Nate and Raina probe into a suicide of a man who lives at the same place as his sister.
Jinny and Magda investigate a fire that caused a stampede inside a nightclub.
A child molester is set free by a Supreme Court ruling but then is later murdered. Suddenly, his victims are suspects and the investigators have to find out who did the crime.
The inspectors must investigate a family to solve a deadly car bombing; Nate's relationship with a married woman takes some unexpected turns; Jinny and Kate both struggle with family and relationship issues.
A drug dealer is murdered in an upscale San Francisco neighborhood; Nate is thinking about breaking up with his girlfriend after he thinks she's mentally disturbed.
The investigators must go undercover after a whistleblower states the city's must vulnerable children are in trouble; A recovering drug addict kidnaps her child from a foster home.
After the victim of a vicious crime awakens from a 9 year coma, the division seeks to find the perpetrator of the crime.
Stacy discovers an illegal immigration ring through one of her friends. Regan continues to try to find evidence that will prove her son's innocence.
Raina is abducted by a killer who preys on young women; Stacy finds herself caught between her past and future when her ex-fiance shows up.
A homicidal maniac demands that a murder suspect be released or he will kill Raina as she uses all her strength to stay alive until the inspectors find her.
The inspectors try to discover who killed an assistant D.A. and turn up some shocking surprises; Raina and Stacy taking dangerous turns; Jinny seems to be a little too overprotective with her baby.
A missing pregnant woman turns up murdered and there are many more suspects than imagined; Kate begins suffering from empty-nest syndrome.
The squad is put on a high alert after a school is threatened with total destruction by armed gunmen. The division must find a way to rescue the students caught inside. Meanwhile, Jinny's upcoming nuptials make her fellow inspectors re-evaluate their commitments to their own significant others.
In the series finale, armed invaders threaten to blow up a school with 10 students and one teacher trapped inside. As the clock ticks, all the division try to figure out who these terrorists are and how to stop the villainous plan. All this happens on Jinny's and Hank's wedding day, no less.