Midsomer Murders - Season 9 Episode 4 Down Among the Dead Men The deadliest county in England.
Overview: Barnaby and Jones investigate the shooting of a blackmailer, Martin Barrett. But he had so many victims, they are spoiled for choice for a suspect. Then one of his victims, Sir John Waverley, gets another demand. The trail leads them to the seaside and diving for treasure on an uncataloged wreck.