In 1930 an expedition from Miskatonic University met a terrible fate in the Antarctic interior after having broadcast about incredible fossil findings in the foothills of a massive previously undiscovered mountain range.

In 1933 the Starkweather-Moore Expedition sets sail for that distant, forbidden continent in the hopes of exploring those vast mountains of madness, and bringing their secrets back to civilization.

This is the chronicle of Beyond the Mountains of Madness, as told through surviving letters and telegrams, newspaper articles, word-of-mouth and radio transmissions.