A single person-but with two personalities: one that's noble and kind and another that's pure, repulsive evil. Robert Louis Stevenson's engrossing masterpiece about the dual nature of man-and a good doctor whose thirst for knowledge has tragic consequences-serves up all the suspense and satisfying chills one expects from the best horror and science fiction. A single person-but with two personalities: one that's noble and kind and another that's pure, repulsive evil. Robert Louis Stevenson's engrossing masterpiece about the dual nature of man-and a good doctor whose thirst for knowledge has tragic consequences-serves up all the suspense and satisfying chills one expects from the best horror and science fiction.