As a result of the police's mistake during a counter terrorists' operation, an innocent person was killed. Detective Inspector Steve Arnott refuses to take part in the concealing of the crime. After that, he was transferred to the anti-corruption unit that was headed by Ted Hastings. The superior tasked Arnott to investigate the case of a senior officer of the central police unit. He had recently become the officer of the year.

Other seasons of this show:

Line of Duty (season 1) Line of Duty (season 2) Line of Duty (season 3) Line of Duty (season 4) Line of Duty (season 5)

See also:

Doctor Who (season 12)
Death in Paradise (season 9)
The Stand (season 1)
Castle (season 4)

Download links and episode guide:

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Episode 1    
S05E01 - Episode 1

Episode 2    
S05E02 - Episode 2

Episode 3    
S05E03 - Episode 3

Episode 4    
S05E04 - Episode 4

Episode 5    
S05E05 - Episode 5

Episode 6    
S05E06 - Episode 6