In late 19th century London, Dr. Henry Jekyll is a renowned and respected physician conducting experiments to relieve pain using a new anesthetic called ether. However, his experiments take a grotesque turn when a mishap leads him to accidentally combine the ether with a potent hallucinogen. The unintended result transforms Jekyll into a bestial alter-ego, who embarks on nocturnal rampages through London's seedy underbelly. Under this dark persona, he becomes drawn into a world of indulgence and perversion, driven by his own repressed desires and unchecked lust for power. During the day, Jekyll continues his respectable life, but as night falls, his sinister transformation escalates beyond his control.

As his monstrous persona begins to dominate and wreak havoc, a string of brutal murders terrorizes the city, attracting scrutiny from both law enforcement and high society. The deeper Jekyll sinks into his dark alter ego, the more he risks destroying the life and reputation he has painstakingly built. Caught between his dual existence, he finds himself on the edge of sanity as he struggles with the internal battle between his professional life and the murderous impulses of his alternate self. The tension mounts as Jekyll is torn between reigning in his dark deeds or descending fully into madness, putting everything he holds dear at stake.