Starting over isn’t easy, especially for small-town guy John Nolan who, after a life-altering incident, is pursuing his dream of being an LAPD officer. As the force’s oldest rookie, he’s met with skepticism from some higher-ups who see him as just a walking midlife crisis.
Officer John Nolan is once again face-to-face with serial killer Rosalind, and she wants him to know she's not done with him yet. Meanwhile, officers Bradford and Chen work undercover with Detective Lopez and the Las Vegas Police Department to arrest leaders of a major criminal enterprise.
Officer John Nolan is moving closer to his new role as a training officer. In preparation, he is tasked with overseeing Officer Aaron Thorson and must uncover the truth about another officer’s suicide. Meanwhile, Lucy’s successful undercover assignment earns her an invitation for specialized training in Sacramento and she must decide if this is the path she wants to take.
Officer John Nolan is assigned his first rookie, Officer Celina Juarez, whose unconventional approach to police work poses a unique challenge for him.
Rosalind returns with a vengeance and Bailey’s life is left hanging in the balance. With a ticking clock, the LAPD and the FBI join forces, and Officer John Nolan is forced to make a deadly decision after a harrowing ultimatum.
Officer John Nolan and Officer Celina Juarez are on the hunt for a fugitive after a car incident goes awry. Meanwhile, a past injury comes to haunt Tim and Lucy comes through during his time in need in more ways than one.
Officer John Nolan and a sleep-deprived Celina investigate a cash deposit linked to an old DEA case. Meanwhile, Wesley grows increasingly concerned about his deposition and is shocked when he realizes Elijah’s attorney is a familiar face from his past.
Officer John Nolan and Celina witness a shooting, realize the victim was already dead, and investigate further. Back at home, Bailey has been feeling off-center ever since the proposal, leaving Nolan to wonder what he can do to make her feel more comfortable. Elsewhere, Lopez and Harper enlist Lucy’s help to investigate the gang-related murder of a local shopkeeper.
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 jeopardize Officer Celina Juarez's career. Meanwhile, Sergeant Grey and his wife, Luna, go to New York to visit their daughter, Dominique, only to realize she never made it home from the night before.