The old-fashioned firm of Tingley’s Titbits had built up over a number of years a good and solid reputation, which was now in danger of being ruined. Indignant customers were returning jars of liver paté, sandwich spread, spiced anchovies and other such delicacies. Analysis showed that the contents had been adulterated with quinine. Arthur Tingley, the proprietor, was at his wits’ end. It was n...