Rain on the Wind by Walter Macken
From boyhood to manhood big, gentle Mico had but two passions in life - the sea, and a young girl so terrible lovely-lookin' it raised your heart to heaven just to see her smile.
But with a hideous birthmark on his cheek, a Jonah to those he loved, and only the simple life of a fisherman to offer, how could he hope to win Maeve?
The white-capped waves and a great old black bitch of a boat brought the answer . . .