...Or, sometimes, just plain surviving it. The Second Invasion had no plot, no GM-directed units, nothing but vast, incredible, unstoppable numbers of undead swamping the entire continent in a rising tide of destruction.
That said, I've been doing my best to drop some clear hints about what needs to be done (and, perhaps more relevantly in the very-short-term, what won't work). I know that information distribution can be a problem, though.