Nearing the end of the training, Nolan faces his biggest challenge as a police officer yet when he must come to terms with the choices he made in search of the truth.

Nolan and Harper are assigned to a community policing center in an attempt to rebuild the station's reputation.

Nolan's mother makes an unexpected visit after a broken engagement. Sgt. Grey wants to retire.

Officer Jackson West's relationship with his new training officer, Stanton, has escalated and he begins to work with Sargent Grey to find a solution.

Officer Nolan is taken hostage by a man with nothing to lose; Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in their relationship that could end Jackson's career.

Officer Nolan's decision to return to school in order to become a training officer proves to be much harder than he expected; Officer Chen considers going into undercover work after getting a taste of the job.

The team gets the true crime docuseries treatment when they analyse a recent case featuring a former child actor whose adult life has garnered him a cult following.

Officer Nolan, Officer Harper and Detective Lopez are assigned to the kidnapping of the son of a criminal court judge who has a long list of enemies who could possibly be involved.

An Amber Alert sends the team on a race against time to find a newborn infant who was stolen from a local hospital. Meanwhile, Officers West and Chen work their last shift as rookies as Officer Nolan continues on for 30 more days.

Two new Boots start at the mid-Wilshire station - Lucy gets jealous of how her FTO Tim treats his new charge. John's professor comes to the Sergeant with an annoying issue that goes from minor to terrifying overnight.

Officers Nolan and Bradford hope they can de-escalate a drug war before any innocent lives are lost. Meanwhile, Officer Harper hopes she can get Officer Chen ready to go undercover.