.27 is a number Ruby hates. It's a number that marks the percentage of the population that has survived. It's a number that means she's one of the "lucky" few still standing. And it's a number that says her father is probably dead. Against all odds, Ruby has survived the catastrophic onset of the killer rain. Two weeks after the radio started broadcasting the warning, "It's in the rain. It's fatal and there's no cure," the drinkable water is running...