When the brilliant and enigmatic soprano Marguerite Duval is found dead in her dressing room during a performance at the Metropolitan Opera House, whispers of a vengeful phantom haunting the theatre's dark corners begin to spread. Detective Charles Lambert is called in to investigate, only to find himself entangled in a world where the line between reality and legend blurs.

As Lambert navigates the opera house's labyrinthine passageways, hidden secrets, and superstitions that grip its cast and crew, he unearths a tangled web of ambition, love, betrayal, and obsession. Each clue he discovers seems to pull him deeper into the shadows of a forgotten society and its dangerous rituals, as strange events on stage and off blur the boundaries between the world of the living and the spectral.

With time running out and another murder looming, Lambert must confront the true face behind the mask and unravel the mystery of The Phantom of the Opera House before he becomes the next victim in a deadly performance where the stakes are life and death.