Donna Leon's Commissario Guido Brunetti Mysteries Season 1 Episode 15 Through a Glass Darkly

In German with English subtitles. The Venetian island of Murano is known for its artisans who specialize in the traditional craft of glassmaking. When the owner of a glass factory is found murdered, Commissario Brunetti uncovers a connection between the colorful, filigree glass products that he made and some very toxic poisons.