Book excerpt: 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.