Sophie is at work on Friday morning, when the power goes out. As she waits for it to be restored she notices that her fully charged cell phone won't turn on. A horrifying thought crosses her mind and she runs to look out the window. The street is full of cars that are all stalled and people milling around looking at their non-working cell phones. She realizes that this is much worse than a simple power outage and that she must act quickly if she wants...