When Cal MacCarl gets a phone call to his bachelor flat in Glasgow asking him to come to the bedside of his Aunt Mary, dying miles away on the Isle of Lewis, he embarks on a journey of discovery. With both his parents dead, his Aunt Mary is his only remaining blood link. When she goes he will be the last of the family line and he couldn't care less. In the days between his aunt's death and funeral he is drawn into the role of genealogy detective. In a place where everyone knows everything about everybody, Cal finds that secrets are buried deep and begins to understand that Aunt Mary was not the woman he knew and he might not be the person he thought he was.