The team try to get Rosalind to help as they frantically search for Officer Chen. Officer Lopez finds Wesley in a bad way.

Nolan has a surprise run-in with an ex-flame. Officer Bradford is forced to accept help from Officer Chen as he preps for his sergeant exam.

Jessica has some surprising news for Officer Nolan. Officers Bradford and West are tasked with a community policing project helping out the Watts Rams.

Officer Nolan navigates his relationship with Jessica and a developing rapport with Grace while working a high-stakes criminal case involving an undercover homeland security agent. Officer Chen meddles with Officer Bradford's love life.

Officer Nolan struggles when the rookies are tasked with developing their first confidential informants. Officer Chen navigates a tricky situation.

National security issues arise as Officers Nolan and Harper investigate a murder. A surprising source prompts Officer Bradford to face his past when he crosses paths with a homeless veteran.

Things take a shocking turn for Nolan as he makes a discovery that could put his life and career in jeopardy.

Officer Nolan tries to reunite a family, while Officer Harper's past resurfaces and threatens to jeopardise an overnight visit with her daughter.

Officer Nolan starts his birthday babysitting a crime scene in a law office. Meanwhile, two of the rookies are set to receive special awards.

Each unit is tasked with following up on dormant cases in the hope of discovering new leads. Meanwhile, Nolan gets some life-changing news.

The pressure is on for Officers Nolan, Chen and West as their training officers evaluate whether they are truly ready for the job.

Officers Nolan and Harper escort four juvenile offenders to a Scared Straight program at a correctional facility, but it quickly becomes a riotous situation. Nolan is uncertain about Grace after she fails to introduce him to her ex-husband.

Basking in the adulation from his latest movie premiere, actor Vince joins his childhood pals Eric, Drama and Turtle to debate attending their high-school reunion.

Larry is blackmailed by an employee and tormented by someone from his past; Jeff and Larry pitch a new creative venture; Susie gets turned on by a surprising source.

Ellie's basketball coach makes life tough on everyone; Pete dates a married woman; Andre tries to help with a trade.