Arden Highmore was living your average postgrad life in Rochester, New York, when someone flipped the "off" switch on the world. No cell phones, no power, no running water—and no one knows why. All she and her roommate, John, know for sure is that they have to get out, stat. His family's cabin near the Canadian border seemed like the safest choice.

It turns out isolation doesn't necessarily equal safety.

When scavengers attack, it's John's ridiculously handsome brother, Gabriel, who comes to the rescue. He saves Arden's life, so he can't be all bad…but he's also a controlling jerk who treats her like an idiot. Now their parents are missing and it seems John, Gabriel, their kid sister, Maggie, and Arden are the only people left alive who aren't bloodthirsty maniacs.

No one knows when—or if—the lights will come back on and, in the midst of all that, Arden and Gabriel are finding that there's a fine line indeed between love and hate. How long can they expect to last in this terrifying new world, be it together or apart?