"A popular theatrical superstition holds that every theater has a ghost, and some theaters have traditions to appease ghosts. Similar superstitions hold that ghost lights provide opportunities for ghosts to perform onstage, thus appeasing them and preventing them from cursing the theater or sabotaging the set or production."
The Opera Populaire has its infamous Phantom of the Opera, yet hidden in the walls of the theatre is a ghost light. This will ' o' the wisp has more secrets than anyone knows even exist. Secrets that could destroy Christine Daae. So naturally, the Opera Ghost would want to destroy this 'Ghost Light', but will he be in for more than he can handle? And how is this ghost light connected to Madame Giry?