The Phantom of the Opera is a novel by writer Gaston Leroux. It was first published as a serialisation in "Le Gaulois" from September 23, 1909 to January 8, 1910.
Christine Daaé's mother died when she was very young. She and her father, a famous violinist, traveled all over Sweden playing folk and religious music. Her father was known to be the best wedding fiddler in the land. During Christine's childhood, her father told her many stories. A character known as the Angel of Music figured heavily in them, especially one about a girl he called Little Lotte, who was able to hear the Angel of Music. When Christine meets and befriends Raoul, he also enjoys her father's many Stories.
Later, when Father Daaé is passing away - probably of tuberculosis - he tells Christine that when he dies he will send the Angel of Music(the phantom) to her. Christine grieves for her father endlessly. She lives with an elderly woman whose now deceased husband had been her father's benefactor.
Christine is eventually given a position in the chorus at the Paris Opera House. Not long after she arrives there, she begins hearing a voice which sings to her and speaks to her. She believes this must be the Angel of Music and asks him if he is. The Voice agrees and offers to teach her "a little bit of heaven's music." The Voice, however, belongs to Erik, a disfigured genius who was on the construction crew when the Opera was built and who secretly built into the cellars a home for himself. He is the Opera ghost ("Fantôme" in French can be translated as both "ghost" and "phantom") who has been extorting money from the Opera's management for many years. Unknown to Christine, at least at first, he has fallen in love with her.