The Gothic Scriptures

Cautious investigators will hesitate to say that Arthur Horace Warden was killed by a heart attack, since the past ten years revealed an entirely different person. During that time, however, he managed to author an incredibly enigmatic and cryptic manuscript which was written in a tongue completely unknown to the human race. He had begun to act like an entirely different person after a coma, frightening his former associates with terrible eyes and whispers of another tongue.