"The Phantom of the Opera" is a novel by Gaston Leroux, first published in 1910. It tells the story of a mysterious figure known as the Phantom, who lives beneath the Paris Opera House. The Phantom is a talented composer and musician, but he is also disfigured and shunned by society. He becomes obsessed with a young soprano named Christine Daaé and uses his influence to help her succeed in her singing career. As Christine rises to fame, the Phantom's love turns into jealousy and rage, leading to dramatic events at the opera. The story explores themes of love, obsession, and the struggle between beauty and monstrosity. It has been adapted into various films, musicals, and stage productions, making it a timeless tale of romance and tragedy.