When a boy is targeted by a powerful cartel, two detectives with complex pasts race the clock to keep him safe, but when Syd's personal quest for justice threatens their efforts, the pair must decide whom they really serve and protect.

Tracking down a serial killer who lures his victims into isolated areas before killing them live on social media; Syd has a dangerous secret that clashes with McKenna's complicated past.

Syd and McKenna are called to investigate when a body seems to plummet from the sky; the partners realize they need to trust each other to escape the ghosts of their pasts.

Time is up – Syd and McKenna need to get Knox’s fentanyl into police custody while leaving no trace of their own involvement. But can they pull it off when McKenna is distracted by Izzy’s strange behavior and a ghost from Syd’s past returns to haunt her?

Syd and McKenna ramp up their personal search for Gabriel Knox and let the Bens in on their search for Arlo. Syd faces a family crisis. McKenna must make a difficult choice.

While fighting with their own complications, Syd and McKenna try and find the killer behind the death of a transgender woman. Syd must face her past as the hunt for Knox intensifies. McKenna helps Izzy deal with her grief.

McKenna is unable to keep hiding the truth about her mother's accident from Syd. Arlo plots against people Syd loves. Syd and McKenna continue to hunt for the killer of the transgender woman and her fiancé.

McKenna is forced to come clean about her past to her husband, and both she and Syd attempt to convince him to bend the rule of law to save a life. In the meantime, our team find themselves trailing a group of thieves who managed to steal million of dollars' worth of untraceable diamonds.

It's busy for our team of detectives as they continue to investigate the case of the missing diamonds, and the task force executes a major drug bust. With the treat of Knox looming, both Syd and McKenna must confront some of their deepest secrets yet.

With McKenna's help, Syd searches for Jen's killer as she grieves the loss of her friend. The death of a Koreatown legend has the community up in arms wondering who could be responsible.

As the team searches for the culprit behind the Koreatown crime surge, McKenna is triggered by memories from her experience in Iraq. Syd discovers a tape of Jen with an unexpected client.

After confronting one of Jen's old clients, Syd and McKenna think they are on the right track when their lives are threatened; on the Koreatown case, the team finally zeroes in on the criminal

With the Koreatown shooter behind bars, the team catches a new case involving a collegiate swimmer who is found dead in an apparent hit-and-run. Syd uncovers a new clue from Jen's past.

As their pasts continue to crash into the present, Syd and McKenna discover that an unknown player has been manipulating them all along. Meanwhile, the search for the missing diamonds continues, just as McKenna is face with a impossible choice; her brother or her future.

After a stunning discovery, Syd and McKenna debate who they can trust moving forward whilst also investigating a death that took place at a scenic Los Angeles park.

After sharing the truth about Jen's passing with her family, Syd receives some unexpected help on the case. McKenna and Patrick make a tough decision.

After the team connects a new mobile app to a string of crimes, it learns that the Koreatown crime wave is far from over. Syd discovers a shocking truth about who Jen really was.

Amidst the chaos of investigating a case that overlaps with Nico's new hustle, McKenna starts family therapy, and Syd delivers bad news to Jen's family.

Syd learns that the crime wave in Koreatown is forcing people out of their homes, drawing the attention of Ricky Leon. The LAPD searches for the team responsible for a deadly dispensary robbery.

As Syd and McKenna finally close in on Gabriel Knox, a shocking revelation makes their fight more personal than ever before.

Syd, McKenna and the team band together as they race against the clock to save one of their own, finally coming face-to-face with their greatest enemy.

When Emma goes missing, Syd will stop at nothing to bring her back home to her family. An undercover McKenna attends a veteran's retreat that could be sourcing the highly skilled Koreatown criminals.

Syd and Baines are threatened by an internal affairs investigation regarding Beverly Gamble's death; McKenna and Walker interrogate Duke Ingram which leads the team to an unexpected arms dealer.

The LAPD team races against the clock to rescue one of their own.

McKenna grieves the death of a loved one with Syd by her side. The LAPD detectives work as a united force to put an end to Lustrum Holdings and restore peace in Koreatown.