The Crystal Blue Persuasion — Rodman Philbrick

SUNKEN GOLD BECOMES BLOOD MONEY IN A GULF-STREAM STORM OF SEX AND SLAYING

The Rosario, a Spanish galleon loaded with gold, sank four centuries ago off the Florida Keys. Now a, smooth-as-silk-tongued treasure hunter named Harper King said he had the key to finding that fortune, with a lot of other people's money. And it was up to T. D. Stash, laid-back fishing guide and part-time detective operating out of Key West, to put on his sleuthing cap, climb into diving gear, and plunge into the depths of a mystery where hammerhead sharks below the surface were nothing compared to the human ones above it. In less time than a hurricane could wink its eye, Stash was deeply immersed in a case of ghoulish greed where sex was the ultimate sales pitch and death the final payoff...