Mean High Tide — James W. Hall

Beneath the still blue waters off Key Largo a woman dives into a dazzling array of color. But behind the shimmering schools of fish, somewhere in the shadows of the reef, a death trap awaits. In minutes one life will be expertly, brutally taken, and another plunged into a mean season of fury, obsession, and revenge....

His name is Thorn. His world is mangrove islands, open waters, and the ghosts of a too-violent past. Darcy Richards was everything to him. Now, finding her killer is. Wading into a seething mystery, Thorn is catapulted into a nightmare of violence and deception. There lurks a sensual young woman with a hard come-on, an aging former mobster, and a diabolical ex-CIA man. What they all have in common is each other's mad ruthlessness--and a little red fish that will make some people very rich, and others very dead....