Fifteen years after the events of the feature film, Kyle Craig is assigned to go undercover in an elite squad of the LAPD as Detective Frank Rourke’s trainee to spy on him and report on his off-book methods. As Frank starts teaching his principled trainee the way of the streets, they form an uneasy alliance that will change the course of both their lives irrevocably.
An investigation into weapons trafficking becomes personal for Tommy when an old friend becomes connected to the case. Lockhart demands to see results from Kyle’s investigation into Frank’s actions, leading Frank to reveal surprising information to his trainee.
Deputy Chief Lockhart opens an internal investigation into a past shooting which could cost Frank his badge and freedom, forcing Kyle to help Frank clear his name or risk losing the one man who could help him solve his father's murder.
When Frank's longtime friend and informant is killed by Yakuza assassins, his quest for revenge puts him and Kyle at odds with an FBI agent whose operation against the Yakuza is jeopardized by Frank's actions.
The rift between Kyle and Frank grows when Kyle refuses to adhere to one of Frank’s morally ambiguous rules. The pair must put aside their differences when they learn the notorious hitman known as 'El Cucuy' is targeting members of the Russian mob in Los Angeles,
Kyle grows concerned that Frank's rogue tactics will put a kidnapped girl's life at even greater risk after a former member of Muammar Gaddafi's Amazonian Guard becomes involved in the deal and ups the stakes for the girl's return.
An idealistic officer is tasked with going undercover on the team of a a jaded, rogue detective, in order to bring him down.