Anyone have any suggestions? I was wondering if something Fiasco-like for an initial setup would be helpful. Another element I'd like to add is something like a literal countdown clock: the runners all have a watch that is counting down to a Very Bad Thing, said thing to be determined through a series of questions. So in addition to escaping the Chasers the runners have something they need to do other than discover who they are.
Also if anyone's tried either of these things I'd love to know what you did and what your experience was.