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Quincy suspects foul play after a young Mexican arrives at the hospital writhing in agony. Quincy discovers he has been stung by a venomous stone-fish - a creature not found in local waters. When the boy later dies, Quincy collects samples for analysis - and someone mugs him and steals them! Now certain that someone has got away with murder, Quincy must figure out who and why, while fighting opposition that comes all the way from Washington, D.C.