Twelve Mile Limit by Randy Wayne White

On a crisp November morning, four divers set off for an excursion fifty-six miles off the Florida coast. Two days later, only one is found alive, standing naked atop a light tower in the Gulf of Mexico. Of her three companions, not a trace exists. One of them is Doc Ford's friend, Janet Mueller. Then the rumors begin--of kidnapping and murder. But Doc needs to know what really happened on that dark, starry night out in the black Gulf Stream. He thinks he's prepared for anything. He doesn't know how wrong he is. Or how far and dangerously adrift his quest for the truth will take him.

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