On the cusp of summer, angels-terrifying creatures of eyes and wings-have laid waste to human civilization, leaving a single survivor. Months later, Erika Cantor is alone in her hometown with no way to make sense of what's happened. Then a strange radio broadcast lures her into the grim outside world, a ruined place reclaimed by nature and inhabited by demons. She soon encounters Midori, a secretive girl with a fondness for the angels. Then there's Gav, a strange boy determined to relentlessly follow Erika. He knows more than he should, but he refuses to answer any of Erika's questions. The enigmatic Fex is even more of a mystery, and he shares his goals with no one. While combing Vermont in search of any remains of world, Erika discovers that the horrific angels have plans for the rest of humanity-and she might play a part in whatever they're plotting.