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After one of their own is shot, the team suffers a series of close calls and realizes their division may be a target for a group of masked assailants.

Officer Nolan gets a lesson in respect after his arrest of a gang member leads to a free-for-all on his life; officer Chen and Bradford pull over Mario Lopez, who thinks he can talk his way out of a traffic violation.

Officer Nolan and the entire team are in a desperate search to rescue Officer Chen after her abduction and must attempt to get Rosalind to help them in their search.

Officer Nolan and team are charged with escorting a notorious female serial killer. Meanwhile, Officer Chen meets a seemingly perfect man who sparks her interest, and Officer Lopez worries about Wesley as his PTSD continues to increase.

Nolan's split decision during a robbery causes an investigation. Bradford's wife becomes an informant, and a meeting with a drug trafficker goes awry.

Lucy and Tim are unsure of where their relationship is leading them. Nolan and Juarez find themselves in a tricky situation. Angela and Nyla are scheming up a plan.

Officer Bradford's wife, Isabel, is found shot but alive and he vows to track down the man responsible. Meanwhile, Officer Nolan must protect his home and the truth after a home invasion attack.

As the rookies prepare for a big exam to see who moves on to the next stage of training, Nolan and Bishop are called to the scene of a murder and learn that the victim may be tied to a potential terrorist attack on the city of Los Angeles.

Nolan spends his birthday guarding a crime scene in a law office. Bradford and West receive special commendation. Harper requests an early annual review.

Their rookie year is coming to an end and officers Nolan, Chen and West are about to be squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job. Meanwhile, after one of their rookie classmates is involved in a shooting, the team uncovers some unsettling evidence.

When a prison bus crashes, some inmates face severe injuries while others seek an opportunity to flee; in the wake of the accident, officer Nolan tries to impress an FBI hostage negotiator while tracking down an escaped convict.

Officer Nolan and team are on a hunt to retrieve a buried stash of gold before any treasure seekers get hurt. Meanwhile, Bradford is tasked with encouraging the oldest cop at the station to retire and invites him to ride with him.

The team mobilizes to locate a suspect after a deadly series of events affects one of their own. Meanwhile, Celina takes on her first case with Bailey's help.

John and Celina find themselves in a hostage situation while undercover for a public safety initiative. Tim challenges Lucy's decision-making skills.

Officers Nolan and Harper are tasked with escorting four juvenile offenders to a Scared Straight program at a correctional facility that quickly becomes a riotous situation.

Officer Nolan mildly injures himself while chasing down a shoplifter and the local DA wants to charge the suspect with assault despite Nolan's wishes. Meanwhile, Lucy goes undercover, Lopez' wedding venue is seized by the FBI and Nolan meets his new neighbor.

Officer Nolan and Celina take on a special case. Monica enlists help to identify her attackers. Lopez and Harper discover a connection to the trail of crimes.

Wesley rejoins the DA's office after leaving LAPD. His history becomes relevant to a current investigation. Bailey and John disagree about safety issues. Lucy becomes wary of Seth's behavior.

Officer Nolan and Sgt. Grey are paired up for the day on patrol. Nolan's son Henry and Grey's Daughter visit the station.

The rookies undergo a field training day where their training officers wear plain clothing while riding with them.

Sergeant Gray informs the rookies that they must track down a specific set of crimes in a 48-hour period in order to qualify for their final exam. Meanwhile, Officer Nolan and Officer Bishop answer a silent alarm call at will.i.am's house.

The team searches for a serial killer as Nyla struggles with the attack. Lucy's relationship with Seth takes a turn, while Bailey battles her fear of Jason.

On Celina's last day as a rookie, John gives her one final test, Bailey makes a new friend, and Lucy places her faith in Seth for an undercover assignment.

The officers grapple with the aftermath of a plotted attack on the city of Los Angeles, leaving Bradford fighting for his life.

Officer Nolan's first day with his new training officer gets off to a rocky start. Officer Bradford struggles to find a birthday gift for a new girlfriend. Officer Lopez has a case that triggers difficult memories.