In the second book of the series, Wren is finally free of the dome, but the outside world is not the paradise everyone thought it would be. She constantly blames herself for the deaths of many of her friends and is determined to protect those that have survived. This becomes a problem when they encounter rovers, who have weapons that can kill from a distance. Not only does Wren worry about the people she strives to protect, she also worries about the ones still inside the dome. Did they survive the explosions that flooded the mines?

Meanwhile, a band of explorers from across the ocean come and offer to help the survivors. Wren begins to doubt her love for Pace after meeting Levi Addison, who offers to show  her the world from his airship. She tries to remain faithful to Pace, but she can't help but wonder if maybe it was circumstance that brought them together. Things only get worse when word arrives from Wren's friends, from inside the dome, asking for help. Now, she must return inside the dome, the thing she dreads most. Once she's inside, will she be able to get back out?