Did the phantom do it?

There has been a murder in an opera. One of the ballerinas is found dead, drowned in the bathtub, or so it seems. Next to the bathtub is the letter from the 'Opera ghost' who demands the managers to retire, or else there will be more murders. Managers, scared for their lives, listen to the ghost and put Armand Moncharmin and Firmin Richard as the new managers and a famous composer, Oren Carrell, as their right-hand man. As time passes by, police put the case as 'unsolved'. A few days by, Oren confronts the ghost. Surprisingly, he gets on the ghost's good side and starts to learn the ghost's past, realising that they're not that different.

Based on the book.
I made the book cover, however, the picture doesn't belong to me.