Since I don't have access to the specific 'the phantom killer true story', it's difficult to determine precisely who the phantom killer was. It could be a local criminal who gained a reputation for being almost invisible when committing murders or other heinous acts. There could be a whole backstory about this person's upbringing, relationships, and how they developed their modus operandi. Maybe they had some special skills or knowledge that allowed them to be so elusive, like knowledge of the local area's back alleys or a talent for disguising themselves. But again, this is all speculation without more details about the story.
Sure, the story of The Phantom of the Opera is in English. It's a well-known classic that's accessible in multiple languages, including English, allowing people from different parts of the world to enjoy it.