from the Keeper's Introduction:
This adventure is the kick off point for a Delta Green style operation, based inside the United Kingdom. The English investigators are going to be dragged into a web of intrigue involving the spontaneous combustion of Mr Simon Michaels, a planning officer from the town of Craig Mills in North Yorkshire.
A nuclear storage facility has been taken over by Majestic-12 for the use as a base for MJ-8 Sub Project JOSHUA. This Project is concerned developing Xeno-biological weapon systems, and chemical agents that will effect Greys but leave human beings unaffected.