Dangerous Knowledge(1976)

Dangerous Knowledge is a gritty 1976 mystery thriller following Bill Kirby, an insurance salesman who returns to the UK from France only to find himself hunted by two armed agents. Accompanied by Laura Marshall, Bill must evade his pursuers while a series of murders unfolds around him. As bodies pile up, he races to uncover who orchestrated the killings and why he's become their target. Starring John Gregson and Prunella Ransome, this six-part serial combines tense cat-and-mouse chase sequences with the darker elements of 1970s British crime drama, delivering a propulsive narrative that keeps the mystery at its core throughout.