Season 1 is the best way to catch the explosive start of AC-12's hunt for "bent coppers" without worrying about internet buffering. Where to Legally Download & Watch Offline

The season ends with a stunning conclusion, as Arnott and McCoy confront the ringleaders of the conspiracy. Justice is served, but not without sacrifices. The stage is set for a thrilling second season, as the fallout from this case sets off a chain reaction that threatens to upend the very foundations of the PSNI.

Arnott is tasked with investigating a notorious crime lord, known only as "Gates," who has been evading capture for years. As Arnott digs deeper, he uncovers a web of corruption that reaches all the way to the top of the Police Service of Northern Ireland (PSNI).

The investigation leads them to a money-laundering operation linked to Gates, and they close in on their suspect. But just as they think they've made a breakthrough, new evidence surfaces that throws everything into chaos.

UK viewers can download episodes for free on BBC iPlayer using the mobile app. Season 1 Overview: Why It’s Must-Watch