Dr Jekyll has discovered the ultimate drug. A chemical that can turn him into something else. Suddenly, he can unleash his deepest cruelties in the guise of the sinister Hyde. Transforming himself at will, he roams the streets of fog-bound London as his monstrous alter-ego. Paperback , Penguin Popular Classics , 96 pages Published March 31st 1998 by Penguin Classics (first published January 5th 1886)