The story is conducted from a third party, represented through an outside observer of Notary Gabriel Atterson. In London, strange events are taking place - a certain demonic person named Edward Heid, who suggests the inexplicable disgust to anyone who communicates with him, makes a number of disgusting misconduct, meaningless and cruel. It turns out that it is somehow closely connected with Dr. Henry Jekyl respected in society. Heid at times appears at his house, and the servants are ordered to perform all his requests. Moreover, the doctor writes a testament, in which, in the case of his death or disappearance, leaves all Heydu.
Once Dr. Jackiel locks out in his office, refusing to show eye, communicating with a homemade unnatural voice. It is assumed that the criminal Heid killed the doctor and unable to leave the doctor's house, gives himself for the dead.
In the posthumous letter found received by Atterson, Dr. Jackiel admits that he came to the scientific discovery, which consists in the fact that there are several aspects of the same person in the human psyche at the same time, and a person, as such, there is a product of the simultaneous combined action of all these personalities. As a result, he was uncompressed by the end of the scientific experiment, he was able to find a way to his negative "I" temporarily engage in the dominant. Mr. Heid, making monstrous atrocities, is the same Dr. Jackiel, in which his evil start received power and could calmly sin in this shell. However, the doctor stopped controlling the process of its transformation into Heyda, which led the Doctor to despair and death.
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