The Rookie, The Enemy Within

Officer John Nolan and Celina witness a shooting, realise the victim is already dead, and investigate further. Back at home, Bailey has been feeling off-centre ever since the proposal.

Officers John Nolan and Celina Juarez are in a race against time to stop the source of an explosive rampage.

Officer John Nolan and the team investigate the unexpected death of a suspect in police custody. Their search also uncovers a very delicate loose end that could jeopardise Officer Celina Juarez's career.

Detective Nyla Harper and James find themselves in the middle of a bank robbery which leads the entire team on a citywide manhunt. Meanwhile, Tim and Lucy finally go on their first date.

The search for a missing boy leads the team into the middle of a dangerous drug war.

Officer John Nolan and Celina are enlisted to stand guard at a hospital after a dangerous prisoner must have surgery and they suspect there's more to it than meets the eye.

Amid a heatwave and a citywide blackout, Officer Nolan and Aaron follow increasingly large leads after discovering criminals hiding at the station. While on duty, Officer Chen makes an alarming discovery.

Officer John Nolan and Bailey are on the hunt for a mystery gunman after a shooting hits a little too close to home. Meanwhile, Aaron struggles to live within his means and joins Lucy to help Tamara.

With the FBI's help, Detective Lopez risks everything to help Elijah take down a gang leader in exchange for her safety. Meanwhile, Nolan and Bailey deal with his late mother's secrets and shady dealings.

The team must stop a militia from detonating a highly combustible truck in their possession. Meanwhile, Officers Nolan, Thorson, Juarez and Detective Harper search for three men exposed to Ebola.

Now that Elijah and Abril have become allies, the team must rely on Monica, Elijah's lawyer, to uncover their plans. Meanwhile, Officers Nolan and Juarez reopen her sister's case.

When Dim goes missing, Officer Chen and Sergeant Bradford, along with the CIA, set out to find him and enlist the help of Juicy.

The team investigates a pattern of kidnappings which leads them to a discovery that hits close to home with one of their own. Meanwhile, Lucy and Tim's relationship is put to the test.

Officer Tim Bradford's ex-wife returns and asks the team to help her save someone from her undercover past. Isabel's return also creates additional pressure in Lucy and Tim's relationship.

Officer Lucy Chen goes undercover to infiltrate an illegal firearm operation, and Detective Harper and Officer John Nolan work together to solve a mystery involving severed limbs.

A chilling and action-packed season finale. 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.