In the dead of winter, the electricity goes out. Not just in your town, but in many small towns nearby. After a few hours, power returns — but not everywhere. In some places it's out for days. Hospitals struggle to keep generators running to treat hypothermia sufferers; emergency lines are jammed, preventing ambulances from being dispatched. An overwhelmed police force struggles to maintain calm. What first appeared an inconvenient accident is soon revealed as an act of sabotage: Someone wants the power down. Someone is sowing chaos and waiting to take advantage.