Officially licensed by Chaosium, Inc.
From the back of the box:
"The year is 1910. Bathed in pale Spring sunlight, the small fishing port of Illsmouth is a sleepy New England town where time seems to stand still. Appearances can be very deceiving, however .... Beneath the peaceful tranquility of this small village, a horrifying truth lingers.
Whispers in a dusty, secluded library ripple with fear as questions of the past are brought into the present. Is there a link between the return of Halley's comet and the resurgence of the Great Ancients who once dominated the land in a reign of terror? Legend tells tales of an ancient ritual ground, hidden deep in the shadows of the tangled forest, marked by an ornate and mysterious cross. Once, long ago, this site was the stage for wild and terrifying rites that no one dare speak of, lest they suffer the wrath of the Ancients.
Why are the townspeople of Illsmouth struck by such shattering terror? Why are they drawn to the ancient ritual grounds after so many years? What has released this curse from its deep sleep to play havoc upon the souls of innocent people?
The answer to these puzzles lie in the seven letters that have emerged from the darkness .... CTHULHU!"