Detective Lydia Adams is assigned a new partner, Ruben Robinson, a former Marine, as she confronts a former confidential informant. Officer John Cooper's successful back surgery allows him to return to the job after his treatment for drug addiction. Cooper learns he has been teamed with a new partner, Jessica Tang. No longer a trainee, Officer Ben Sherman is partnered with Sammy Bryant, who continues to struggle with the loss of Nate Moretta.moreless
A young man who had been scheduled to testify in one of Sammy Bryant's cases is killed 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.moreless
Two meth addicts kidnap John Cooper and Hank Lucero, and the search for them takes priority over everything else happening in the precinct. Elsewhere, Ben Sherman juggles obstructing Sammy Bryant's search for Strokeface with pacifying Brooke who is increasingly unhinged.
Cooper tries to save a suicidal teenager who's in a situation that affects him personally. There are serious consequences when Sammy tries to convince a former addict to be an informant. Jessica Tang has a visitor from someone in her past as Lydia and Ruben investigate a possible home invasion that appears to have been staged to cover up a murder.moreless
Ben Sherman continues to help a prostitute and her daughter, and he and Sammy are attacked by the woman's pimp. Lydia and Ruben investigate the murder of a gangbanger who may have been killed over a graffiti tag. Jessica Tang's promotion to sergeant could be compromised due to her shooting of an innocent bystander.moreless
Officer John Cooper's past physical problems are tested when he and Officer Tang are attacked by a perp on the street. Detectives Adams and Robinson investigate a convenience store murder, and Lydia charms a grandmother to collect facts on the suspect. Officers Sherman and Bryant ride along with a mistake-proned officer. Joel Rucker takes over as the new captain.moreless
Lydia and Ruben investigate the death of a young nanny that appears to be a suicide, 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.moreless
Lydia Adams hunts Cooper's kidnappers. Sammy Bryant thinks he has found the real thieves. Meanwhile, John Cooper deals with the kidnapping and Lydia grows closer to Russell Clarke.
Captain Joel Rucker orders the officers to monitor the streets of Los Angeles on Hood Day, and a violent gang war erupts when Officer Bryant intentionally leaves a gang territory unattended. Detective Robinson practices his speech for his daughter's Quinceañera during a murder investigation. Officers Cooper and Tang investigate a robbery in a strict Orthodox Jewish home, which leads Tang to reveal parts of her past.moreless
Jessica's past is revealed after she offers help to a veteran who is homeless. Meanwhile, Sammy takes care of a dog of the vet bill after he accidentally shoots it. Lydia and Ruben investigate the murder of a Good Samaritan as Lydia face a huge change in her life.
Officer Jessica Tang is served with divorce papers in the morning that appears to have affected her judgment in a shooting later in the shift. Sammy Bryant holds a grudge against Ben Sherman for not backing him up over drug evidence that may have been planted during a previous arrest. Meanwhile, Lydia is still hesitant to discuss her pregnancy with Ruben and Det. Fernandez.
Officer Jessica Tang prepares for her last day on patrol before she transfers to another precinct as sergeant, but she needs to deal with unresolved issues on her beat first. Ben Sherman and Danny Ferguson are partnered together as Sammy Bryant recovers from his injuries, but Ben wants to spend his time helping the prostitute and her daughter get away from the abusive pimp who is controlling their lives. Meanwhile, Lydia Adams makes a decision about her police duties during the rest of her pregnancy.moreless
John Cooper's routine traffic stop turns into a confrontation with boot Gary Steele. Lydia Adams looks into the murder of a man whose wife is a boxer. Ben Sherman does some investigating of his own after a drive-by shooting injures Dave Mendoza.
Lydia Adams and Ruben Robinson search for a John Doe. John Cooper's attempt to rescue Hicks is hampered by past demons. Sammy Bryant weighs telling the truth about the tape. Ben Sherman makes a commitment to Elena while still involved with Brooke.
John Cooper gets his new partner on the same day MCDC has a major outage and emergency calls aren't dispatched timely. Amidst the ensuing chaos, Sammy Bryant and Ben Sherman's partnership becomes more strained. Elsewhere, Lydia Adams tries to connect with an old love.
Tammi strikes back, which means Sammy Bryant must answer questions from Internal Affairs about their altercation. John Cooper turns to Hicks for a sympathetic ear after a bad day, but he doesn't find one. Ben Sherman enjoys a complicated love life. Lydia Adams investigates a baby's death and is more shaken than she would like to admit.moreless
Ben Sherman takes steps to arrest a drug dealer, Dewey Dudek's foot pursuit turns dangerous, and Sammy Bryant starts his 15 minutes when an action turns him into a mini-celebrity. Elsewhere, John Cooper wonders what retirement will do to him and a death row inmate reaches out to Lydia Adams.
John Cooper's new boot, an Afghanistan war veteran, rubs him the wrong way. Lydia Adams grapples for the perfect balance of work and parent responsibilities. Elsewhere, Sammy Bryant files for custody against Tammi, and Ben Sherman hooks up with a new cop who has a dangerous attitude.
It seems every gang member in the basin will show up for a drug lord's funeral, and the officers must deal with the resulting free-for-all on the streets. Ben Sherman makes the decision for Sammy Bryant about the tape, but does not expect the results the decision brings. Lydia Adams and Ruben Robinson work the murder of Sgt. Hill's son, but disagree on how to handle the evidence that incriminates another officer. Elsewhere, John Cooper's isolation feeds his depression.moreless
The first day on the job for a rookie cop isn't going to be easy, especially when his training officer is tough-as-nails veteran Officer John Cooper. Meanwhile, Det. Lydia Adams investigates the disappearance of a little girl who had vanished while playing ball.
Detective Sal Salinger asks Lydia and Josie for help when a four-year-old is killed in a drive-by shooting in a series of gang murders. Officer John Cooper is asked to monitor Dewey after he returns from rehab, Ben Sherman is teamed up with Chickie Brown.
John Cooper and Hank Lucero spend their shift answering odd calls. Sammy Bryant and Ben Sherman's shift is consumed by a bank robbery. Meanwhile, Lydia Adams and Ruben Robinson track a killer who appears to have cooked his victim's body.
After a member of Marta Ruiz's Avenue gang is found dead, Det. Bryant persuades Det. Adams to help Janilla. Meanwhile, the rift between Det. Salinger and his teenage daughter continues to worsen.
Officer Sherman reveals details of his past that explain his motivation to be a cop. Meanwhile, Officer Chickie Brown questions her partnership with Dewey when the latter becomes starstruck and fails to do his job.
Detectives Moretta and Bryant step in to aid Det. Salinger when he crashes into a light pole and members of a gang steal his weapon. Meanwhile, Det. Adams is taken aback when a man exposes himself outside her home.
When a young woman is found is murdered at the S.U.L.A. campus in Compton, Det. Adams and her new partner, Det. Ray Suarez, investigate the case. Officers Cooper and Sherman attend a funeral in Indian Wells and visit Dewey in a halfway house.
Detective Adams is suspended from duty and bonds with an injured witness. Meanwhile, a high-speed chase during which a bystander is killed haunts Officer Chickie Brown as Officer Cooper attempts to clean up a neighborhood.
An investigation is opened when Officers Cooper, Sherman, and Brown find an abandoned baby in the middle of an intersection. However, the case proves to be too close to home for Det. Adams, whose involvement with the investigation forces her to deal with past issues. Meanwhile, Detectives Bryant and Moretta find themselves in a difficult situation when they can't seem to gather sufficient funds to place a teenager under police protection for her safety.moreless
Detectives Bryant and Moretta are summoned to an alley in Los Angeles where the body of an unidentified woman is being used by street thugs for target practice. Meanwhile, Det. Moretta reveals the truth about his sister.
When Detectives Adams and Clarke investigate jewelry thieves who are targeting homes in Bel Air, Officer Sherman becomes involved personally when he discovers he knows one of the victims. Meanwhile, as Bryant and Moretta prepare Janilla for trial, Det. Bryant uses unconventional means to insure her safety.