The Gathering Murders — Keith Moray

The mysterious drowning of Ranald Buchanan, an acclaimed Gaelic fisherman-poet, on the first night of the literary festival hardly sets the right tone for the celebrations. For one thing, it rekindles age-old fears about the Selkie, the seal-folk who claim their victims and drag them beneath the waves... Torquil McKinnon, Inspector in the Hebridean Constabulary, soon has his hands full. Not only has his old flame, crime writer Fiona Cullen, returned to the island for the festival, but it also appears there is a serial killer on the loose. And dead writers tell no tales...