Having never used a WoTC published adventure before, and being a brand new DM with totally new players, I was completely lost with CoS when I read through it the first time. I was expecting the book to be in sequential order, and that myself and my group could follow it from page to page. When I found this guide, everything clicked into place and made our CoS campaign extremely enjoyable. We have now gone on to purchase more WoTC campaigns, and are looking forward to more guides from this author. Thank you for a invaluable product!