Ashes (The Ashes Trilogy), Ilda J Bick (Ex. Lib)

No, she thought.  No, please.  God, I'm not seeing this.

Seventeen-year-old Alex is hiking through the wilderness when it happens:  an earth-shattering electromagnetic pulse that destroys almost everything. 

Survivors are divided between those who have developed a superhuman sense and those who have acquired a taste for human flesh.  These flesh-hunters stalk the land: hungry, ruthless and increasingly clever...

Alex meets Tom, a young army veteran, and Ellie, a lost girl.  They will fight together and be torn apart, but Alex must face the most difficult question of all: in such a vastly changed world, who can you trust?