The Phantom of the Opera

The Phantom of the Opera (French: Le Fantôme de l'Opéra) is a novel by French writer Gaston Leroux. It was first published as a serialisation in Le Gaulois from September 23, 1909, to January 8, 1910. It was published in volume form in April 1910 by Pierre Lafitte. The novel is partly inspired by historical events at the Paris Opera during the nineteenth century and an apocryphal tale concerning the use of a former ballet pupil's skeleton in Carl Maria von Webber's 1841 production of Der Freischutz. Nowadays, it is overshadowed by the success of its various stage and film adaptations. The most notable of these are the 1925 film depiction featurin Lon Chaney and Andrew Lloyds Webber's 1986 musical. source

The Phantom of the Opera is mostly about a girl named Christine Daae (DI-A), a ballet dancer at the Paris Opera House. She is the musical student of a man who most call the Opera Ghost but who she calls the Angel of Music. His real name is Eric, and he lives in the lake below the Opera House. He is teaching her how to sing. When the main female lead at the opera leaves, Christine is called upon to sing and does so beautifully. 

But this does not bode will for her. A man, who she has known for some time, name Raoul, sees her sing and remembers her. He is romantically interested in her, but Eric will not allow it. Instead of letting them go off together, Eric kidnaps Christine in order to instruct her further. After unmasking him and revealing horrible deformities on his face, Christine runs away. 

But now she is the enemy of the Phantom. She must run from him at all time when she is in the Opera House, which also makes Raoul afraid. 

In desperation, after another performance by Christine, Eric kidnaps her again. He tries all manor of things to kill Raoul, who follows them down under the Opera House. Instead of doing so, however, he ends up making Christine and Raoul even more in love and even more desperate to escape. 

"The Phantom of the Opera" is a hideously deformed musical genius who hides in shadow, living beneath the Paris Opera house (which he himself designed some years earlier). Forced to live this way due to the fact that he has become a killer, his motives in life are changed when he falls in love with a young prima donna named Christine, a girl he has secrety been giving singing lessons. 

       But when a young man named Raoul DeChagny vies for the love of Christine, a deadly rivalry ensues- which will determine the fate of not only Christine, but of the entire Paris Opera House. source