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Double Down 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.
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Labor Day 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.
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Dye Hard Officer John Nolan is assigned his first rookie, Officer Celina Juarez, whose unconventional approach to police work poses a unique challenge for him.
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The Choice (I) 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.
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The Fugitive 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.
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The Reckoning 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.
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Crossfire 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.
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The Collar Officers John Nolan and Celina Juarez are in a race against time to stop the source of an explosive rampage.
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Take Back 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.
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The List (I) 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, but it does have a few complications.
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The Naked and the Dead The search for a missing boy leads the team into the middle of a dangerous drug war between two rival gangs.
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Death Notice Nolan and Celina must stand guard at a hospital after a dangerous prisoner needs surgery. Aaron, Lopez and Harper look into a string of robberies. Tim and Lucy consider how their secret relationship will affect their work. Lopez gets unexpected news.
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Daddy Cop In the midst of a heatwave and a citywide blackout, Officer John Nolan and Aaron follow increasingly large leads after they discover criminals hiding at the station. While on duty, Officer Chen makes an alarming discovery after being called to a scene where a pungent smell has wreaked havoc. Meanwhile, Lucy and Harper scheme to get Tim out of his new job and into a more exciting position.
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Death Sentence 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 when the mother of a child she babysits goes missing. Elsewhere, Wesley suspects that a judge is taking bribes after he excludes valuable eyewitness testimony from a case.
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The Con With help from the FBI, Detective Lopez puts everything on the line to help Elijah Stone take down a gang leader in exchange for her safety. Meanwhile, Nolan and Bailey must deal with the secrets and shady dealings his late mother left behind.
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Exposed 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 who may have been exposed to Ebola and detain them for quarantine.
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The Enemy Within (I) 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 and discover a discrepancy that leads them on a new trail.
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Double Trouble When Dim goes missing, Officer Chen and Sergeant Bradford, along with the CIA, set out to find him and enlist the help of Juicy.
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A Hole in the World 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 as they begin to feel the hard hours of their jobs.
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S.T.R. 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 as they assist in the search.
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Going Under (I) 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 found around the city.
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Under Siege 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.