A handful of grain is found in the pocket of a murdered businessman!Let us explain: Rex Fortescue, king of a financial empire, was sipping tea in his 'counting house' office when he suffered an agonising and sudden death. On later inspection, the pockets of the deceased were found to contain rye grain. What is that all about? It was another incident, this time in the parlour at his home, which confirmed Jane Marple's suspicion that here she was looking at a case of crime by rhyme!