Everyone has a dark side. 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. It seems he is master of his fate. It seems he is in complete control. But soon he will discover that his double life comes at a hideous price...

This dark psychological fantasy is more than a moral tale. It is also a product of its time, drawing on contemporary theories of class, evolution and criminality and the secret lives behind Victorian propriety, to create a unique form of urban Gothic.

In Robert Louis Stevenson's influential novel of mad science and criminal inquiry, attorney Gabriel John Utterson comes to the aid of Dr. Henry Jekyll, an old friend, only to find himself dragged from a world of genial hospitality into London's foreboding night, which is shrouded in shadows and fog—and stalked by the deranged Edward Hyde. Utterson's quest for truth is not only a detective story laden with twists, but an intense meditation on man's inherently dualistic nature, written in a style that often combines disturbing violence with restrained language typical of the Victorian era.

A Complete Annotated Listing More than 1,500 titles in print Authoritative introductions and notes by leading academics and contemporary authors Up-to-date translations from award-winning translators Readers guides and other resources available online Penguin Classics on air online radio programs

"Olalla" is a short story by the Scottish novelist, poet, essayist and travel writer Robert Louis Stevenson. It was first published in the Christmas 1885 issue of The Court and Society Review, then re-published in 1887 as part of the collection The Merry Men and Other Tales and Fables. It is set in Spain during the Peninsular War. A Scottish soldier recovering from his injuries in Spain goes to stay with a local family, where he eventually meets the beautiful Olalla and falls in love with her. But things won't be smooth sailing for either of them...