Lightning Strikes (Angels of Ember Trilogy)

Could Elizabeth truly make lightning come down from the sky? The world outside Ember Paine’s window has gone mad. After a horrific virus wipes out the majority of the population, terrorists march door-to-door hunting down the survivors. When Ember’s ten-year-old sister is kidnapped from their yard, she must leave the safety of her home. If she doesn't find Elizabeth before the bad men discover her gift. it could mean the end for all of them.