From publisher blurb:
In this 27-page timeline for Fate of Cthulhu, your heroes will face the most dangerous threat of all: an infectious idea.
A basilisk is any idea which is dangerous to the beholder. A catchy tune that gets so stuck in one's head as to become harmful. Certain visual phenomena that cause damage to the vision processing areas of the brain. The Basilisk we know, the one called Godthink by those infected, subsumes its beholder entirely. The Basilisk we know is not some errant sound or image that maims or kills those who come across it. It is a way of thinking, a worldview, a community of minds so aligned and so connected as to become a single gestalt force, bent on expanding itself infinitely and destroying or converting any opposition. The Basilisk we know will consume everything.
The Basilisk is an idea, not an entity, so it cannot be killed or destroyed. Analysts have, however, identified four moments which, if altered, can slow the idea's spread or give the Resistance better tools for fighting indoctrination.
This is your mission. Get ready to travel to the past—and beware of hazardous ideas.