Cassie Forrest isn't surprised to learn that the day she’s decided to get her life together is also the day the world ends. After all, she’s been on a self-imposed losing streak since her survivalist parents died: she’s stopped painting, broken off her engagement to Adrian and dated a real jerk. Rectifying her mistakes has to wait, however, because Cassie and her friends have just enough time to escape Brooklyn for her parents’ cabin before Bornavirus LX turns them into zombies, too.

Rose Winter has enough problems. With a marriage going down the tubes and a dreaded anniversary party on the horizon, the last thing she needs is the zombie apocalypse. She wanted to get drunk and sing karaoke, not murder her undead neighbors. It’s clear the party’s over, however, now Rose has more problems - a missing husband, an overbearing houseguest, and keeping her family alive.

Sylvie Rossi has the loner thing down pat, with the exception of her best friend, Grace. But when the two are trapped in a hospital during the last gasp of a dying city, alone time is no longer an option. A nurse's offer of sanctuary promises Sylvie the supplies she needs to survive the zombies - it's the coexisting with people that might do her in. Eric Forrest will do whatever it takes to get into the dead city for his sister, including ending up dead himself. He's used to taking risks, but with every mile he travels death looks likelier.

For dinosaurs, it was a big rock. For humans: Coronal Mass Ejection (CME). When the Earth is hit by the greatest CME in recorded history (several times larger than the Carrington Event of 1859), the combined societies of the planet's most developed nations struggle to adapt to a life thrust back into the Dark Ages. In the United States, the military scrambles to speed the nation's recovery on multiple fronts including putting down riots, establishing relief camps, delivering medical aid, and bringing communication and travel back on line. Just as a real foothold is established in retaking the skies (utilizing existing commercial aircraft supplemented by military resources and ground control systems), a mysterious virus takes hold of the population, spreading globally over the very flight routes that the survivors fought so hard to rebuild.

Half of the earth's population has been wiped out. Impossible to predict or stop, the Gamma Ray Burst tore through the Earth like a bullet, its radiation wave killing hundreds of millions, and the after effects ensuring the deaths of billions more.