Ep 1. Episode 1

In Line of Duty season 4 episode 1, viewers are introduced to a brand new case that the AC-12 team must investigate. As the episode opens, we see the aftermath of a deadly ambush on a police convoy. Three police officers are dead, with a fourth in critical condition. The only survivor of the attack is a young woman named Jane Cafferty, who was in the police convoy as a forensic coordinator.

As the AC-12 team begins their investigation, they quickly discover that the case is much more complicated than it first appears. At the heart of the matter is a notorious criminal organization known as the balaclava men. This group has been operating in the shadows for years, and their connections with corrupt police officers make them nearly impossible to catch.

As the team begins to dig deeper, they uncover a web of lies and deceit that goes all the way to the top of the police force. The head of the investigation, Roz Huntley, seems to be more interested in protecting her own reputation than in finding the real culprit behind the attack. Meanwhile, the AC-12 team is dealing with their own internal conflicts. DS Steve Arnott is struggling to come to terms with his injuries from a previous case, while his boss, Superintendent Ted Hastings, is finding it difficult to navigate the politics of the police department.

Throughout the episode, viewers are treated to a tense and gripping storyline that keeps them guessing until the very end. There are more than a few twists and turns along the way, as the AC-12 team races against the clock to track down the people responsible for the police convoy attack. Along the way, they must deal with their own personal demons and overcome the obstacles that stand in their way.

Overall, Line of Duty season 4 episode 1 is a thrilling and action-packed episode that sets the tone for the rest of the season. With strong performances from the cast and an intricate plot that keeps viewers on the edge of their seats, it's clear that this is a show that knows how to deliver the goods. Fans of crime dramas and police procedurals won't want to miss this season, which promises to be the best yet.