Serpent and the Rainbow

Dennis Alan heads to Haiti in hopes of obtaining a mysterious potion that represses the nervous and respiratory systems without causing death; this draught would also scientifically explain the myth of the zombie. Once on Caribbean soil, however, Alan encounters powerful cults, government corruption and a poverty-stricken populace ready to revolt -- and he finds himself deeply seduced by voodoo, though his sense of logic cannot comprehend its mystical nature. But more earthly dangers lurk in the form of an evil magistrate and the local police, who do not hesitate to torture Alan when he defies their leader. In the end, Alan emerges from the experience radically changed, with the realization that Western notions of science cannot explain the many things he's witnessed in this world.