The world is a conspirationand the PCs are in its mids. As members of a secret society they fathom the dark world of the Unknown.
Using th sign of the doublefaced Janus-head since 1690 people meet to unearth the mysteries of mankind in a scientific way. The society is helping them with a hidden network of bases, the faculties.
Sometimes, the Janobite meet the foul Cthulhu-mythos. And the denagerous knowlegde not only brings death, but the characters might also find out that not everyone of the society is on thier side.