When a well-known eccentric scavenger in Key West shows Dusky MacMorgan a golden chain, it's no ordinary trinket-it's the key to finding a treasure at the bottom of the sea. Before MacMorgan can find out where that is, the eccentric vanishes off his boat, the apparent victim of a shark attack. But MacMorgan suspects the true killer walked on two legs. Surrounded by predators in and out of the water who are armed with both brute strength and breathtaking...