Father Brown - Season 3 Episode 9

Father Brown attends an open day at the vineyard Colonel Forbes-Leith runs with French viticulturist Gregoire Bisset but the wine is contaminated by a dead dog in the vat. Suspicion falls on sinister handy-man Henry Gibbs, who is blackmailing the colonel, whom he knew in the war, and when Gibbs is shot dead the colonel is arrested. Father Brown visits him in prison and discovers that he is not who he seems to be and that he is covering for the person he believes to be the real murderer.