The Mystery of Swordfish Reef

On a calm October day in an Australian seaside town, three met set out to sea for a day's fishing... and do not return. Despite intensive searches, no trace or the men or their boat is founds, until weeks later, a passing trawler hauls in a gruesome catch - the head of one of the missing fishermen. It is clear that its owner was murdered with a pistol shot, but by whom, and why, is for Bony to find out.