Establishing shot of a town centre, the dark clouds go over in slow motion, and you see everyone in suits and office wear but you can't see their faces, walking around everything looks normal and then they all stop and turn to look in the same direction and they're all wearing masks, a sound goes off echoing through the buildings and they snap out of their trance and carry on like nothings happened, then cuts to other busy places where the same thing happens. Then it cuts to a week earlier.