"The cryptographic key is the entire text of Frankenstein." There are actually two different editions of Frankenstein - Mary Shelley heavily revised it many years after the first edition. But I guess they picked the correct one :-D
I said a few episodes ago that I didn't think there were any real bad guys in this. I'm more convinced of that than ever. Some characters' choices and actions might be questionable, but I don't think they have bad intentions.