In a grim and foggy London, crime journalist Edmond Bancroft, known for his sensationalist tales, becomes embroiled in a series of horrific murders that shock the city. Bancroft enjoys notoriety from his true crime writing and his private collection of gruesome murder devices, housed in his "Black Museum." Working closely with his assistant Rick, who harbors disturbing tendencies of his own, Bancroft seems to have an inexhaustible fascination with the macabre and violent demise of unsuspecting victims. With Scotland Yard struggling to solve the grisly murders, Bancroft continues to soak up the public attention and draw inspiration from the cases for his dark stories, further blurring the lines between his professional interests and personal obsessions. As more victims fall prey to horrifying deaths, public fear reaches a fever pitch, and curiosity piques about who could be behind these atrocious acts.

The brutality of the murders horrifies even seasoned detectives, creating a climate of fear and intrigue. Bancroft’s relationship with people around him begins to unravel as suspicions mount, yet he remains curiously well-informed about each monstrous act. Through a narrative of psychological tension and morbid curiosity, the thin veneer of civility in Bancroft’s demeanor begins to crack, revealing unsettling truths. The reporter's interactions with those nearest to him add to the chilling atmosphere as new depths of depravity are explored. What unfolds is a disturbing journey into the psyche of individuals fascinated by death and inflicted pain, leading to shocking revelations as the web of mystery tightens.