A high three: enjoyable but it didn't blow me away. Definitely reminded me of Douglas Adams books and Simon Pegg movies, and if you like that type of British-style humor then you'll probably find this funny and worth the read. I never thought I'd see the Large Hardron Collider featured in a book about demons, but it plays a very prominent role, as does quantum physics, which was totally not what I was expecting.Two things to note; first, this is an adult book and not YA, and many people have it shelved incorrectly. It's appropriate for a YA audience, though it was definitely a bit gory, but it's categorized as adult. I suppose that's not a big deal but it bugs me. Second, this takes place a few days before Halloween so if you're looking for something with that theme then this is a good pick.This was a super quick read that contains a precocious young male protagonist and his dachshund sidekick attempting to thwart Hell coming to Earth. Many demons were harmed in the making of this book. I liked the author's style so I'll be checking him out sometime in the future.