This is the first book in the series. Usually when people think of Hawaiian legends, one of the first that comes to mind is about Nanaue, the Shark-Man. He is a demi-god, park human, part shark god, all scary.
In the novel we see some of that scariness, but we also see a son faithful to his father. A man who is a friend of humanity and a person who has faults and failings to rival any human. Mix in a family with deep traditional ties and watch what happens.