Chaosium Stock #2387 (For Call of Cthulhu Edition 5.6)
Call of Cthulhu keepers of forbidden lore can now keep their secrets in style. This three panel Keeper's Screen is jam-packed with vital GM information presented in an easy to use at a glance format. The player's side of the screen features awesome Philippe Caza artwork worthy of its own sanity check. This product includes a new introductory scenario perfect for beginning investigators and keepers alike, as well as three 4-page game aids (weapons table with an alien weapons section, a new 4-page summary of rule book spells, and some character sheet masters to jump-start your new Call of Cthulhu game).
Not too bad if you are a creative GM who wants to work on things.
I picked up this supplement a long time ago. I never ran the scenario, but instead just used the rules for the occasional Cthulhu game. As the years went by I used the Chaosium system less and less and forgot about it.
I am now running a Cthulhu game using the GURPS system and I needed something small to supplement my game. I won't spoil any of the adventure for possible players here, but I will say its a decent low level start. If you are running it at a convention it will work well out of the box. If its for a campaign you will need to fill in a lot of things.
Now that the the rules are very outdated, I wouldn't pick it up for anything unless you could get it used for $0.50.