John Dies at the End

Is this some experiment in allowing a first-time writer to publish a book without ever sending it through the traditional editing process? A blisteringly entertaining opening gives way to a glacial middle third, and then the book just fizzles to a close without any sense of any sort of through-line or cohesion. I guess the through-line and cohesion would appear if you read the follow-up, but honestly, after slogging my way through this, I don't think I'll return for seconds, thanks.