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Currently you are able to watch "Line of Duty - Season 4" streaming on Sky Go, Acorn TV, AcornTV Amazon Channel, Acorn TV Apple TV or buy it as download on Amazon Video, Apple TV.
The fourth series sees AC-12 facing their most devious opponent yet! Under pressure from her superiors, DCI Roz Huntley charges a young man with a series of murders after months of fruitless investigation, but is he guilty? The Chief Forensic Investigator has doubts and turns to AC-12.