Robert Louis Stevenson, a Scottish novelist, wrote the Gothic tale The Strange Case of Dr. Jekyll and Mr. Hyde in 1886. It centers on London-based attorney Gabriel John Utterson, who looks into several unusual incidents. Gabriel John Utterson and Richard Enfield are traversing a huge home.

Enfield witnessed Edward Hyde trampling a little girl.

He had a menacing appearance. Hyde offered Enfield a check that was endorsed by a guy who was eventually identified as Dr. Henry Jekyll. A butler witnesses Hyde beating another of Utterson's patrons, Sir Danvers Carew, to death and leaving behind a broken cane. They discover a letter he sent to Utterson in which he confesses to having become the terrifying monster, Hyde.

When Utterson and Mr. Poole break into the lab, they discover Hyde's body inside, where he appears to have committed himself. Lanyon deteriorated and died as a result of the trauma of witnessing his alter persona.

One of the serum's ingredients eventually ran out, and subsequent versions made from fresh supplies were unsuccessful.

Jekyll penned a detailed record of the events and locked himself in his laboratory intending to keep Hyde imprisoned.

As Poole and Utterson broke down the door, Jekyll committed suicide by poison after realizing that he would remain as changed as Hyde.