On The Rookie Season 4 Episode 22, Nolan is forced to spend a week in solitary confinement in a border town with a young local officer in need of training.

On The Rookie Season 4 Episode 21, Sgt. Grey supports Officer Nolan’s desire to become a training officer and offers to ride with him to get him ready.

On The Rookie Season 4 Episode 20, the LAPD and the FBI are in a race to stop bombs that have been scattered throughout the city by a suspected terrorist.

On The Rookie Season 4 Episode 19, after an explosion at a local power station, the LAPD and FBI trainee Simone Clark work together to catch the suspect.

On The Rookie Season 4 Episode 18, after the robbery of a train filled with valuable auction items turns deadly, the team is called to investigate.

On The Rookie Season 4 Episode 17, Nolan and the team negotiate with a distraught man holding the hospital hostage to ensure his wife gets lifesaving surgery.

On The Rookie Season 4 Episode 16, Thorsen reluctantly decides to be part of a reality show to help rebrand his image, only to be thrust into a deadly situation.

On The Rookie Season 4 Episode 15, after two witnesses for an upcoming grand jury case are murdered, the team must track down the killers before it’s too late.

On The Rookie Season 4 Episode 14, Chen and Bradford hunt for a perpetrator on a citywide crime spree while Nolan and Harper help Skip Tracer Randy.

On The Rookie Season 4 Episode 13, Nolan and Chen must fulfill three quests if they want to get a stolen police helicopter back safely from a teenage thief.