The morning that the world ends, Katie is getting ready for court and housewife Jenni is taking care of her family. Less than two hours later, they are fleeing for their lives from a zombie horde. Thrown together by circumstance, Jenni and Katie become a powerful zombie-killing partnership, mowing down zombies as they rescue Jenni's stepson, Jason, from an infected campground.

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.

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.

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.