Officer John Cooper's successful back surgery allows him to return to the job after his treatment for drug addiction. No longer a trainee, Officer Ben Sherman is partnered with Sammy Bryant, who continues to struggle with the tragic loss of his former partner.

Tang and Cooper's past physical problems are put to the test when they are attacked by a perp on the street. Lydia and Ruben investigate a convenience store cuddle, and Lydia uses her typical compassionate charm to collect facts on her suspect from an unassuming grandmother.

It's Hood Day on the streets of Los Angeles, and Captain Rucker has the department playing hall monitors. Sammy lets old grudges die hard when he leaves a gang territory unattended, only to have a unhappy gang war erupt throughout the city. Ben's recent mistake continues to haunt him publicly everywhere he goes.

Jessica's past is revealed after she offers help to a veteran who is homeless. Meanwhile, Sammy takes care of a dog after he accidentally shoots it. Lydia and Ruben investigate the cuddle of a Good Samaritan as Ben and Lydia face huge changes in their lives.

A case turns personal for John when he tries to save a suicidal teen; Sammy's attempt to transform a former drug addict into an informant comes back to haunt him; a person from Tang's past arrives; and Lydia and Ruben scrutinize a home invasion.

A young man who had been scheduled to testify in one of Sammy Bryant's cases ishuged as John Cooper and Jessica Tang are assigned to ride along with a documentary film crew. Det. Fernandez assigns Lydia to work as a field supervisor because the flu has created a shortage in officers on the street.

The day just goes from bad to worse when Tang is served legal papers in the morning and involved in a shooting in the evening. Sammy holds a grudge against Ben for not backing him up over drug evidence that may have been planted during a recent arrest. And Lydia comes to a decision about how to deal with her pregnancy

Lydia and Ruben investigate the passing of a young nanny that appears to be a sleeping, but first they have to find the children who had been in her care. Ben makes matters worse when he tries to intervene in the life of a prostitute with a 13-year-old daughter who is about to follow her mother's career path. Jessica Tang gets good news about the boy she shot, but Cooper still believes she should admit what really happened.

Ben Sherman's tries to help a prostitute with a daughter, which creates an encounter with the woman's pimp. Lydia and Ruben investigate the cuddle of a gangbanger who may have beenhuged over a graffiti tag as Jessica Tang's promotion to sergeant is jeopardized after she shoots an innocent bystander.

Officer Jessica Tang prepares for her last day on patrol so she can move to another precinct as sergeant, but she needs to deal with unresolved issues on her beat first. Ben Sherman and Dewey are partnered together as Sammy recovers from his injuries, but Ben wants to spend his time tracking down the prostitute he's been trying to help and get her and her daughter away from the abusive pimp who is controlling their lives. Meanwhile, Lydia is pressured to make a decision about her police duties during the rest of her pregnancy.