From the introduction: It’s cold, damp and stinks so bad it makes you want to retch. A bit of scrambling around lets you find a phone in your pocket. Luckily it seems to still have some battery life left. You shine it around your location and see just what is causing that awful stench. Corpses are all around you, crushed and twisted by the mostly collapsed building you find yourself in. It’d be best to get out of a place of death like this, so you stumble out from the one exit of the building you can find that hasn’t collapsed.