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 beauty, he's going hunting for the treasure-and for vengeance.