Callaway Walker has lived underneath the surface for her entire existence. It had been 250 years since the war that made living above ground impossible, and it would be another 300 until Earth would be habitable for humans again. The community that had been born when the first escapers of war found safety in the bunker she grew up in was suffocating. All she ever dreamed of was to feel the sun on her skin and to see the stars that supposedly lit up the night sky for herself. So what happens when a dare causes the biggest secret to be ripped open? And how will Callaway manage to reveal the truth without dying in the process?