Mafia 105. Raid of the Damned

I'm not really keen on tackling the last clue about the serial killer; the wording is too vague, and I don't know where to start. If we're going by the movie about the Three Musketeers, I managed to connect it to Aion, but it was a bit of a stretch, through Chevalier d'Éon. But the connection is weak, to say the least. From the Aion game page on Wikipedia, you can't really go anywhere else except to the CryEngine, and from there, presumably to Ubisoft. I don't know where to go from there.

Added 29 minutes later
In short, the clues are a bit lacking. I hope we haven't missed the mark.