Benbecula by Graeme Macrae Burnet

On the ninth day of July 1857, Angus MacPhee, a twenty-five-year-old labourer from the remote Hebridean island of Benbecula, bludgeoned to death his father, mother and aunt. Five years later, Angus's brother, Malcolm, ostracised by the community and haunted by the past, gives his version of the events leading up to the murders - while trying to keep a grip on his own fragile sanity.