Officer Nolan and the entire team race against the clock to locate Lopez after she is kidnapped on her wedding day, not only to save her life but her unborn child's.
Officer Nolan and Officer Chen's run-in with an infamous thief tips them off to a potentially big heist surrounding the Getty's big gala event. Meanwhile, Nolan works up the courage to ask Bailey out on date.
Officer Nolan and Chen report to a structure fire and suspect that there is more to the situation than meets the eye. Meanwhile, after witnessing a sniper shooting, the team searches for the shooter.
Officer Nolan and Officer Chen search for a missing person who may have international ties that puts everyone's lives in danger; Harper continues the search for a serial arsonist; Wesley must overcome an impossible task.
When a new designer drug hits LA streets, it turns users into "zombies," and Officer Nolan and the team have a Halloween they won't soon forget. Back at home, Lucy questions whether her apartment building might be haunted.
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.
Officer Chen and Officer Bradford demand a treasure hunt rematch and enlist Officer Grey to help set the terms to a new bet, all while they arrest a series of wealthy female criminals.
Wesley finally manages to break free of his dirty contract. Nolan deals with an increasingly serious relationship and underhanded election techniques. Bradford learns some unpleasant things about his parents.
Now that John Nolan knows about Bailey's past, he must decide if they still have a future; when a plane crashes in the middle of the city, the team races to find out why.
The team must rely on a criminal for his expertise to take down a bigger threat. Officers Chen and Bradford investigate a murder of a homeless teenager.
The team responds to the report of a severed hand that has washed up on the beach. Tim attempts to prove his isn't a control freak to Lucy and invites her on a double date.
John Nolan and Lucy Chen must fulfill three quests if they want to get a stolen police helicopter back safely from a teenage thief; Nyla Harper and Aaron Thorson must guard a convicted cop killer in the hospital following a prison riot.
Nolan and Harper help Skip Tracer Randy complete his first bounty. Officer Chen and Sergeant Bradford hunt for a perpetrator on a citywide crime spree.
Harper puts Thorsen through "Plain Clothes Day," but the exercise is interrupted by an unexpected visitor. Meanwhile, two witnesses for an upcoming grand jury case are murdered, and Sgt. Grey might be next on the list.
Officer John Nolan and the team feel they must negotiate with a distraught man who is holding a hospital hostage to ensure his wife receives a lifesaving surgery.
Officer Nolan and the LA division of the FBI enlist the help of FBI trainee Simone Clark when one of her former students is suspected of terrorism following an explosion at a local power station.
Sgt. Grey supports Officer's Nolan to become a training officer and rides with him to help him prepare for the exam. Tim and Lucy decide on their plans for Mother's day and a romantic vacation.
Officer Nolan is forced to spend a week in solitary confinement in a quiet border town with a young local officer who is in need of some training; Sgt. Bradford and Officer Chen go under cover together in a possible drug trafficking case.
