A young man named Jeffrey Dahmer struggles with his disturbing desires and social isolation. Growing up in a dysfunctional family, he endures a turbulent childhood marked by neglect and the dissolution of his parents' marriage. As he reaches adulthood, Dahmer's internal conflicts and dark fantasies begin to consume him. Working in a chocolate factory, he starts frequenting gay bars, where he picks up men and lures them back to his apartment. He becomes obsessed with exerting complete control over his victims and ventures deeper into his depraved tendencies.

As Dahmer engages in increasingly horrifying acts, the film offers glimpses into his psyche, blending moments from his past and present. Flashbacks reveal interactions with his father, who attempts to understand his son's troubled mind but remains oblivious to the depth of his issues. Moments of eerie calm juxtaposed with extreme violence paint a harrowing picture of a man caught in a vicious cycle of compulsion and remorse. The narrative delves into the psychological turmoil that drives Dahmer's actions, ultimately depicting a haunting and complex portrait of a profoundly disturbed individual.