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When a voice from the past brings Barlow information about a crime, he has to balance his new responsibilities at the Home Office against his detective's judgment.
First Air Date : Sep 15, 1971
Last Air date : Feb 26, 1975
Episode : 29 Episode
Season : 4 Season
Runtime: 50:14 minutes
Studio: BBC One
Country: United Kingdom
Cast: Stratford Johns, Derek Newark
