Given the question: Build a movie plot around this: What is Opera house holding to celebrate? The yearly masked ball
The answer is:
The film opens in Victorian London on a December night in 1900. The first night of the season at the London Opera House finds the opening of a new opera by Lord Ambrose D'Arcy (Michael Gough), a wealthy and pompous man, who is annoyed and scornful when the opera manager Lattimer (Thorley Walters) informs him the theatre has not been completely sold out. No one will sit in a certain box because it is haunted. Backstage, despite the soothing efforts of the opera's producer, Harry Hunter (Edward de Souza), everyone, including the show's star, Maria, is nervous and upset as if a sinister force was at work. The climax comes during Maria's first aria, when a side of the scenery rips apart to reveal the body of a hanged stage hand. In a panic, the curtain is rung down, and Maria refuses to sing again.With the show postponed, Harry frantically auditions new singers. He finds a promising young star in Christine Charles (Heather Sears), one of the chorus girls. Lord Ambrose lecherously approves of the selection, and invites Christine to dinner. In her dressing room after the audition, Christine is warned against Lord Ambrose by a Phantom voice. At dinner, Lord Ambrose attempts to seduce her, but as they are about to leave to his apartment, she is saved by Harry. On the ride back home, Christine tells Harry about the voice she heard. Intrigued, Harry takes Christine back to the opera house, where in her dressing room, a voice tells Harry to leave her there and go. At the same time the rat catcher (Patrick Troughton) is murdered by the Phantom's lackey, a dwarf (Ian Wilson). Investigating the murder, Harry leaves Christine by herself where she is approached by a man dressed in black, wearing a mask with only one eye, The Phantom of the Opera. He tells her she must come with him but she screams and The Phantom flees. Harry comforts her and takes her home.The next day Lord Ambrose sends a dismissal to Christine for refusing to come back to his apartment. Lord Ambrose chooses a more willing but less talented singer to...