"The Rookie" Warriors and Guardians (TV Episode 2019) - IMDb
Due to the bureaucratic fallout and the need for a senior officer to watch over him, Nolan is assigned to Detective Nyla Harper. Harper, formerly a successful undercover detective, has been forced back into uniform as a punishment/instructor. Her teaching philosophy is the antithesis of Grey’s stoicism or Bishop’s rule-following; she is chaotic, aggressive, and prioritizes "closing the case" over by-the-book policing.