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When a body is found by a river in Cumbria that is 70 miles from home, eight years of tireless investigative work pass until one vital piece of evidence blows the case wide open.
As the documentary series continues, Tony Blockley and his team find a perplexing murder scene and launch an inquest.
A dangerous killer is on the loose and detectives need to act fast when the bodies of two men are found stabbed to death in neighbouring flats in Derby.