Not the actual book that drives men mad, the collection of short stories that reference the actual book. Which isn't "actual" at all, it's fictional, and...
anyway. I picked it up because I vaguely gathered that it had some sort of vintage lovecraftian horror pedigree. And my impressions, about 4 stories in, are that it's kinda like if Roald Dahl had written Lovecraft fanfic?