Ben Kitto has become the Scilly Isles' Deputy Chief of Police but he finds himself missing the excitement of the murder squad in London. But when the body of a professional diver is discovered, his investigative skills are once again needed. At first it appears that the young woman's death was a tragic accident, but when evidence suggests otherwise, the islanders close ranks. Ben suspects a killer is on the loose in Tresco. Set on the Scilly Isles.