This little novel by Robert Lewis Stevenson is a real classic of the "horror literature". Moreover, its popularity with time only increases.

The scientist puts on a daring and dangerous experiment. From the depths of the subconscious, he releases his dark personality, the sinister scoundrel and murderer, Mr. Hyde. He causes an inexplicable disgust for everyone who communicates with him. Dr. Henry Jekyll, nevertheless, leaves a testament in which, in the event of his death, leaves all to Hyde.