Per Ardua... (BRP)
Normally the Aircraft Research Centre is ignored by the world. Tucked away in the English countryside¸ it quietly does work of low-to-middling importance for the British Ministry of Defence. Recently however that has changed: there are unexplained lights in the skies above the ARC¸ the local villagers are getting restless and breaches are opening up in the Centre's security....
A scenario set in modern Britain (1980s and onward). Written for 2nd Edition Call of Cthulhu Rules. Some modifications may be necessary for later Editions (though these will be minor unless converting to d20).