They thought escaping the bunker was their biggest challenge. They were wrong.

With little food and no resources, the fragile union is beginning to strain. But there’s something else, too - something lurking in the shadows.

When the power died, the bunker went black. But it was nothing like the darkness that awaits them now. A new panic is spreading, but this time, few have hope of escaping it.

This was meant to be a fresh start, a rebirth. Instead, it could be the beginning of the end.

Will Callie and her friends be among the lucky ones? Or will their newfound freedom be short-lived?

They’re about to find out.