The Fisherman's Daughter

I've read The Fisherman's Daughter by Molly Jackson which is set in a remote fishing village in Scotland. A young man, Robbie Fraser, is summoned to the village where he was born and learns about the father he and his mother left behind. The story is of two boys, one Robbie's father, who grow up to be bitter rivals. The other, McBain, is an almost unbelievably evil character who goes to extraordinary lengths to make Fraser unhappy. This is a tale of love, hate, revenge and retribution which I found a little OTT. And I'm puzzled - who is "the fisherman's daughter"? 3/5