A disfigured musical genius haunts the Paris Opera House, manipulating the career of a young soprano while descending into a murderous obsession. Christine Daaé, a rising star at the Opéra Garnier, finds herself caught between the possessive, spectral influence of the Phantom and the earnest affection of her childhood friend, Raoul de Chagny. The Phantom, known as Erik, utilizes his architectural knowledge of the opera house to exert control over the performers and management alike. The narrative employs a journalistic, investigative framework, as an unnamed narrator attempts to piece together the truth behind the legend of the Phantom through interviews and recovered documents. The story operates within the rigid social hierarchies of 19th-century Paris, where the physical and psychological isolation of the protagonist drives the escalating conflict.

Readers frequently highlight the atmospheric tension and the intricate, labyrinthine setting of the opera house as central to the book's enduring appeal. Discussion often centers on the complex characterization of Erik, who oscillates between a terrifying antagonist and a tragic, misunderstood figure. Critics often note the effectiveness of the investigative narrative style, which adds a layer of authenticity to the sensational plot elements. The balance between the romantic subplot and the darker, gothic horror elements remains a frequent point of analysis for those examining the work's legacy. Many readers appreciate how the story moves beyond simple melodrama to address deeper questions regarding beauty and societal rejection.