Season 4 opens with a seismic shift. Nolan and his former training officer, Nyla Harper (Mekia Cox), are now equals – and Nolan is tasked with mentoring , a young socialite turned cop haunted by a murder accusation. This dynamic revitalizes the show: Nolan’s empathy and unconventional wisdom clash with Thorsen’s privilege and inexperience, creating the show’s best mentor-rookie chemistry since Season 1.
The second episode of the season, "The Hammer," serves as the series' 100th episode. It features the highly anticipated wedding of John Nolan and Bailey Nune , though the day isn't without typical LAPD-style chaos. the rookie season 6 2021