Caelin is a survivor. It's been 11 years since a nuclear disaster drove much of the population underground, leaving Caelin and her young sister Mardy topside. When the sisters discover a group of rebels preaching good life for the masses, it seems they've found a safe haven at last.
But as Caelin is drawn deeper into the rebel's inner circle, she discovers the harsh price of loyalty. The rebel's dream becomes a nightmare, sending Mardy on a dangerous mission to the Undercity. Caelin must determine who to trust before her sister and the entire population of the Undercity are wiped out.