The first episode of the police procedural series 'Line of Duty' premiered on BBC Two in the United Kingdom.
The second series of 'Line of Duty' premiered, increasing the show's popularity and critical acclaim.
The third series of 'Line of Duty' began airing, continuing the story and receiving high viewership.
The fourth series of 'Line of Duty' premiered on BBC One, marking the show’s move to a more prominent channel.
Series 5 of 'Line of Duty' began airing, reflecting increased international success and critical acclaim.
The highly anticipated sixth and final series of 'Line of Duty' premiered, concluding the popular show.
Lisa McQueen, a key figure in organized crime, is killed, initiating police investigations into her criminal network.
Anti-Corruption Unit 12 (AC-12) is established to investigate corruption within the police force.
Detective Sergeant Steve Arnott transfers to AC-12 to investigate corruption from within the force.
Detective Sergeant Kate Fleming joins AC-12 bringing undercover expertise and intuition.
AC-12 investigates DCI Tony Gates for links to organized crime and corruption; Gates later dies in suspicious circumstances.
Steve Arnott discovers a group of corrupt officers engaging in criminal activities within the force.
The unit investigates the murder of criminal Tommy Hunter which leads to uncovering multiple corrupt officers.
Kate Fleming conducts covert operations to gather evidence against corrupt officers.
Ted Hastings becomes head of AC-12, leading the fight against police corruption.
Investigation focuses on DS Lindsay Denton's suspected involvement in operative misconduct and corruption.
The unit ultimately identifies 'H', a high-ranking corrupt officer within the police force.
An event exposing the extent of corruption following the death of DS Hill during an investigation.
New leads connect Tony Gates with deeper corruption and criminal conspiracies.
Multiple officers are arrested based on gathered evidence of corruption and criminal activity.
AC-12's long-standing search for the elusive 'Fourth Man' inside the police force comes to light.
