I've been reading The Case of Charles Dexter Ward again lately. I like this story a lot, but it takes its sweet damn time getting to the point. There's far too much of "Dr. Lyman and his followers think Ward went mad here, but this other group of shrinks think it happened here, but Dr. Willet thinks they're all full of shit and that it actually happened here." That being said, it has some of the scariest shit Lovecraft ever put to paper.