DI Jack Mooney has settled into life on the glorious Caribbean island of Saint Marie, but the murders keep coming. And they're more baffling than ever. When a romantic encounter prompts some soul-searching for Jack, the team are in need of a new DI. Enter Inspector Neville Parker, a brilliant puzzle-solving detective from the north of England. The only problem is that Neville's allergic to everything, and refuses to leave his comfort zone. Which makes the Caribbean a nightmare for him. And trying to make sense of Neville is a nightmare for his team.