Loud explosions are ruining sleep for hundreds of Scottsdale residents in the hot July nights, including members of the St. Rose Quilting Bee. Then Maggie's police officer son is injured by one of the blasts, and a church member sleeping in a lounge chair dies when an explosion topples a roof onto him. Some Bee members blame bored teenagers, but Edie is thinking terrorists. The others scoff -- until a bomb at a power substation throws them into darkness.