" The Hunt " (Season 2, Episode 20) is the explosive season finale of The Rookie , originally airing on May 10, 2020. Picking up from the cliffhanger of the previous episode, it focuses on Officer John Nolan's dangerous realization that his friend and mentor, Detective Nick Armstrong, is a corrupt mole working for the Derian crime family.
Armstrong reveals he has already anticipated Nolan's move. While Nolan was away, Armstrong planted incriminating evidence inside Nolan's own bedroom wall to frame him as the mole. "The Rookie" The Hunt(2020)
The episode follows Nolan as he attempts to uncover the truth about Armstrong without tipping off the rest of the LAPD until he has concrete proof. " The Hunt " (Season 2, Episode 20)