Half Lives

Overview
I learned that surviving isn't all it's cracked up to be. If you survive, you've got to live with the guilt, and that's more difficult than looking someone in the eye and pulling the trigger. Trust me. I've done both. Killing takes a twitch of the finger. Absolution takes several lifetimes.
Seventeen-year-old Icie's parents have given her $10,000 in cash, a map of a top-secret bunker, and instructions to get there by any means necessary. They have news of an imminent viral attack and know that the bunker is Icie's only hope for survival. Along with three other teens, she lives locked away for months, not knowing what's happening in the outside world or who has survived. And are they safe in the bunker after all?
Generations in the future, a mysterious cult worships the very mountain where Icie's secret bunker was built. They never leave the mountain, they're ruled by a teenager...and they have surprising ties to Icie.
This high-stakes, original, and thought-provoking adventure from Sara Grant follows two unlikely heroes, hundreds of years apart, as they fight to survive.