This was the very first campaign supplement published by Chaosium for the then-brand new "Call of Cthulhu" RPG. While I see where the other reviewers were coming from, I've run this one on several occasions for groups of players and they always seemed to have a blast. While it does sometimes require a little fast foot-work on the part of the Keeper, it rewards that with a lot of fun for the players. There are plenty of little hooks that can be used to move the players off of the main track of the campaign or to send them on wild goose-chases, though, again, the Keeper will need to flesh those out to make it work -- or he can purchase other scenario packs if he needs to. In addition to the seven "chapters" of the actual campaign itself, there are two additional scenarios ("The Warren," and "People of the Monolith") the latter of which is an excellent very first scenario for totally inexperienced investigators. Player handouts are scanned on separate sheets so they could easily be produced for your players as well. Finally, the price on this one makes it an amazing deal no matter how you cut it. Besides, you've GOT to love a campaign that ties in so many of HP Lovecraft's actual stories in some way or another and takes you to places like Easter Island. If you feel like you have to "railroad" your players too much, I'd recommend simply making sure the clues they need show up -- heck there's an entire RPG rules system that does just that! Be flexible, folks!
As usual DriveThru did an excellent job of reproducing the manual -- especially given that the original was printed in a brownish text that tends to make scanning very difficult. All of the illustrations and textual material is easily read, and even the gray-on-gray information boxes are crisp and clear. Overall, I rate this one a solid five both for quality of the reproduction and because of the otherwise unavailable nature of the material. And did I mention the price? Worth it, by all means!