Few books have as enduring an impact on the literary psyche as Dr. Jekyll and Mr. Hyde. The dichotomy of the characters is matched only by the understated correlation- that there is a little Mr. Hyde in all of us, no matter how good we may seem, waiting only the right events or situations to bring that dark side to life. 
 When I read some new books, those that lack the same impact of the classics, that make me feel like something's missing... sometimes I cry out, as Dr. Jekyll did, "Oh God, give me some of the old!" That is what separates a classic from all else, I think, and this book is a superb example of that.