Brothers Harry and Jack leave Manchester for New York City for their annual weekend getaway. But upon arrival, they find a silent, deserted JFK, where the few ground crew they can spot have all been slaughtered.

Harry and Jack are military veterans, but they've never encountered anything like this.

As they witness the carnage and stumble across murderous madmen in a post-apocalyptic New York City, it becomes clear that escape is the only option--that is, if there is anywhere sane to escape to...

Revised edition: This edition of First Activation includes editorial revisions.