The body in the bracken - Marsali Taylor

Cass Lynch has been persuaded to spend Christmas in the Highlands with her friend DI Gavin Macrae, but their romantic walk by the loch is cut short when they find a skeleton among the bracken. Back home in Shetland, Cass hears about Ivor Hughson, who left his wife and failed business months ago, and hasn't been heard of since. A near-disaster aboard Cass's yacht suggests someone wants to stop her asking questions about his disappearance. Meanwhile, there are eerie reports of sightings of a njuggle, a Shetland water-horse which drowns curious passers-by. Soon it's taking Cass all her wits to stay alive . . .