Donna Leon's Commissario Guido Brunetti Mysteries Season 1 Episode 1 Vendetta

In German with English subtitles. First it's a high society attorney, then a distinguished tax advisor - both murdered within a few days of each other. Inspector Brunetti's investigation leads to Signora Ceroni, who knew both men - and apparently a great deal more. Brunetti has stumbled upon a dark corner of criminality run by the cream of Venetian society.