Officer Nolan navigates his relationship with Jessica and a developing rapport with Grace while working a high-stakes criminal case involving an undercover homeland security agent; Officer Chen meddles with Officer Bradford's love life.

Nolan teams up with new night detective Pablo Armstrong for a murder investigation case that results in an unexpected reunion with a former love interest.

The officers grapple with the aftermath of a plotted attack on the city of Los Angeles, leaving Bradford fighting for his life.

Bored with his success, celebrated mystery novelist Rick Castle teams with NYPD Detective Kate Beckett to solve the case of a copycat killer who re-creates murder scenes from Rick's novels. While solving the case, the two realize that their unorthodox partnership has its benefits and decide to continue working together. Combining his writer's intuition with her creative detective work, they investigate strange homicides in New York, all the while building a strong, if complicated, relationship with each other.

Rebooting the hit movie franchise of the same name, "Lethal Weapon" is set in modern-day Los Angeles, where Detective Roger Murtaugh works a crime-ridden beat. Some of Murtaugh's colleagues at the LAPD include Detective Bailey, Capt. Brooks Avery, and a pathologist named Scorsese. Murtaugh, a married father of three, finds himself working with Detective Wesley Cole, a former international CIA operative who has been everywhere and seen everything. Cole must adjust to life on the West Coast while navigating his partnership with Murtaugh.

When "The Closer" came to a close, doors opened for the detectives in the Los Angeles Police Department's Major Crimes Division, with the biggest opportunity presented to Capt. Sharon Raydor. The captain is now the boss, taking over a department that hasn't forgotten her history of internal investigations targeting them and their former boss, Deputy Chief Brenda Leigh Johnson. As Raydor attempts to mend fences and gain the trust and confidence of her detectives -- her biggest foe in that regard is Lt. Provenza -- she leads a unit that works more closely than Johnson ever did with other police and prosecutors to build airtight cases.

NYPD detectives of the Major Case Squad use unconventional methods to solve crimes. Like its predecessor, the original "Law & Order," its storylines are often based on real-life headlines, and it features a cadre of quirky cops whose mission it is to find the criminals and make them pay.