Having met Bob on several occasions and considering him a friend, I still have no earthly idea where he gets these sick, demented and hilarious stories from. 9d6 is a continuation of the long Caverns & Creatures campaign that sees a group of, to use Bob's own words "A**Holes" finding out what it means to be on the "other side" of the DM Screen. If you're a fan I don't know why you're reading this review, just buy the book already. If you're using this review do decide if you want to jump in STOP (sorry BOB) Don't buy this book. Go buy Caverns & Creatures book 1 and start at the beginning. You're not the type of person to start your Star Wars Saga with Rogue one Right, or jump into Star Trek in the middle of the 3rd season of DS9, or watch Lord of the Rings in the middle of movie 3 are you? If you are, they heck, give Bob your money so you don't waste it on something else first.
Read the whole series, you'll get to this book soon enough and be much happier for it.