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A novel written by the celebrated Scottish author Robert Louis Stevenson and first published in 1886. The story follows the prominent Dr. Jekyll, who believes that the human psyche harbors two conflicting sides of good and evil, and succeeds in creating a chemical potion to separate them. After drinking the potion, Jekyll transforms into an entirely sinister alter ego named Mr. Hyde, embarking on a hidden, dark life where he commits whatever he pleases without being recognized. The events accelerate in an atmosphere of mystery and suspense as those close to the doctor begin to notice the strange and suspicious relationship between him and this monster, attempting to uncover this terrifying secret.

The novel had such a profound impact that the phrase "Jekyll and Hyde" became a common idiom used to describe someone whose moral disposition differs radically from one situation to another.