From the PDF:
In May of 1939, somewhere in the jungles of Africa, a small band of soldiers have stumbled across something ancient. Something terrible. And they are about to suffer the consequences.
Digging for a Dead God is a one-night scenario for Call of Cthulhu. The actual bulk of the story is only a few pages long; most of this small booklet concerns Keeper advice, tricks, props and options. That’s because the whole experience rests on your players. There are no monsters, no moldy tomes, no spells, no magic items. Just a small group of soldiers and a malignant idea infesting their brains.
And that’s enough.