Recon. We are all going about our separate lives in the cities of the North. Then at dusk we get the mobilization call, and without excuse or explanation each one of us drives away. By midnight we are at the staging ground in a forest clearing. This may be the first time we've been together in months. Around 2:30am I am told that we will be striking out before dawn. I decide not to sleep. We are now in groups of three or four, and I don't recognize the others in my group. We set out to explore an office building that appears to have been recently abandoned. The building is composed of over thirty identical floors, each linked by a stairwell to exactly two other floors, neither of which is the floor directly above or below it.