Cry for the Strangers — John Saul

Clark's Harbor was the perfect coastal haven,  jealously guarded against outsiders. But now  strangers have come to settle there. And a small boy is  suddenly free of a frenzy that had gripped him since  birth... His sister is haunted by fearful  visions... And one by one, in violent, mysterious ways the  strangers are dying. Never the townspeople. Only  the strangers. Has a dark bargain been struck  between the people of Clark's Harbor and some  supernatural force? Or is it the sea itself calling out for  a human sacrifice? A howling, deadly...  Cry For The Strangers.