Eighteen-year-old Eden Rosenberg knows how to kill and she's damn good at it. Until recently, her life was pretty easy--get a call from her team's mysterious employer, jet off to a new location, kill some zombies.

But the most recent call is different from the others. Instead of being an isolated incident in the middle of nowhere, it's an entire village at risk. By the time the team shows up, the village is empty, leaving only a handful of infected wandering the streets. Or so it seems until they're ambushed by far too many zombies for their five-person team to deal with.

On the run and trapped within the valley, Eden is separated from her team when she tries to save a little girl from the inevitable fate of the bitten. To make matters worse, she's forced to rely on Alejandro, the one man she swore never to trust again, to watch her back. She hasn't seen him since he walked away from the team--from her--a year ago and she's not even sure what he's doing in the valley in the first place

As Eden races to reunite with her team, she'll have to deal with a homicidal priest who's more than what he seems and a group of survivors she's pretty sure are too stupid to live. But things are more complicated than she realized and soon Eden's forced to confront the truth about the infection; it isn't an accident and those responsible will do anything to ensure no one gets out of the valley alive.