A crime series
This week: Edward Woodward as Francis Didelot's Commissaire Bignon investigates the case of "The Poisoners", dramatised by Derek Ingrey

Always unable to resist an appeal from a beautiful woman, Bignon becomes intrigued by the curious behaviour of a girl who first runs to him for help and then refuses to tell him anything about her troubles. Ignoring his superior officer's advice to leave the matter alone, he begins to make a few tentative enquiries and suddenly finds himself involved in a highly complex case. He discovers the secrets of the Dangeville family; their tangled emotions and the strange pattern of the life they live behind a facade of aristocratic and academic respectability.