The strange case of the doctor Jekyll and Mister Hyde

Gabriel John Utterson's investigations begin for curiosity and worry(restlessness), in spite of the insistent promises on the part of Jekyll that his(her,your) new friend Hyde does not constitute any danger. Everything changes when Hyde murders a respected member of parliament Englishman(English) before a witness. While Utterson helps in the investigation(research) of the crime, Jekyll becomes increasingly solitary and melancholy, and Utterson manages to think that the doctor is concealing Hyde.
There comes a moment in which Jekyll shuts in himself(herself) stupidly in his(her,your) laboratory atenazado for a distress that nobody understands(includes). Another friend of Utterson, Lanyon, dies of a spiritual shock to which the gentleman Jekyll seems to be related. One day the butler of Jekyll, Poole, asks Utterson for help to treat with an unknown individual that, of some form, it(he,she) has managed to enter the laboratory and to kill Jekyll. Both discover that the stranger is Hyde, and when they manage to enter the laboratory, find Hyde's corpse, of which one has faked the suicide, whereas Jekyll does not appear anywhere.
Finally, Utterson reads the letters written by Lanyon and the confession of the Dr. Jekyll. The first one reveals that Lanyon has been a witness of Hyde's physical transformation in Jekyll by means of a potion invented by the latter. It was the horror before such a discovery what took him finally to the death.
Another letter is a confession of the own(proper) Jekyll: in his(her,your) youth, it(he,she) realized that the conscience of every human being consists of two aspects - the good and evil - that are involved in a constant fight. Following(continuing) the hypothesis of which it is possible to polarize and to separate these two components of me, it(he,she) created a potion that could transform a person into the incarnation of his(her,your) damaging part, managing at the same time to purify the good side.After taking the potion, Jekyll was diminishing rather his(her,your) stature, was taking a disagreeable aspect for with all his(her,your) similar ones, was acquiring the force and the trickery of twelve men, his(her,your) wicked nature was becoming dominant, in addition his(her,your) intelligence was becoming strangly brilliant and his(her,your) extraordinary reflections(reflexes); it(he,she) was called this "person" Edward Hyde. After a few transformations to Hyde, and vice versa, Jekyll got used to realizing regularly the metamorphosis in order to be able to submit to antisocial prohibited pleasures, which would never be allowed in the person of Jekyll. Nevertheless, his(her,your) damaging part was done more and more loudly, exceeding Jekyll's aptitude to control her. After the murder of the member of parliament, Jekyll, terrified, it(he,she) decided to stop taking the potion.
Unfortunately for the doctor, after some time of tranquility, the trasformaciones were producing Hyde to spontaneously, improving his(her,your) "powers" and alone Jekyll could remain of this form while the effects lasted, increasingly debilitated, of the potion.Finally there became exhausted a fundamental ingredient of the potion, a salt that he(she) had acquired initially in great quantity. The new remittances of this salt already were not producing an effective potion. Initially(originally), Jekyll attributed it to impurities in these remittances, but finally it(he,she) came to the conclusion of which the unknown impurity was situated in the initial lot, being this one the one that was granting efficiency to the mixture(mixing), for what nevermore it(he,she) might obtain an effective potion, and to there remain turned into his(her,your) dark alter ego Hyde permanently.