A lightbulb in a skull made a map on the wall from the . . .

[Guest]

light showing through the cracks in the skull. Thus began an adventure.

The group travels to the area laid out by the skull/map and while camping hear some rustling in the bushes. They don't find out what it is (but I can tell you that it the same party a short time in the future escaping from something and they freak when they see them selves in the past camping)

Each member of the group seems to have a twin. Tori Rosen's twin is Rose Centauri.

That's about all I can remember, but I would love to read it again.