Haiti, 1811 Captain Carlos Rodriguez loves his mistress Sheila's insatiable sexual appetite. Unfortunately, she's too insatiable. Tired of finding her in the beds of his crewmen, Carlos enlists a local witch to present Sheila with a cursed amethyst that binds her desire within the stone, to be unlocked for him alone.. Cuba, 2011 Deep sea divers Brandy and Ryan are eager to explore the skeleton of a sunken ship, but neither expected to find a beautiful amethyst in the wreckage. An amethyst that unleashes an uncontrollable passion in Brandy that demands to be satisfied. She wasn't interested in Ryan before, but now she can't get enough of him..