Wren MacAvoy is a coal miner. She is a lower class shiner forced to work in order to maintain the royals luxurious way of life. Coal keeps the giant fans running, along with everything elsebecause Wrens world is a giant dome. The royals and everyone else were sent here long ago, in the hopes that they could protect and preserve the bloodline of the royals after a giant comet struck the earth and set it ablaze. As far as anyone inside the dome knows, the outside is still engulfed in flamesbut the domes coal is running out, and conditions are worsening. Wren has always thought there was something more outside the dome, and she is even more certain after her good friend, having attempted to escape the dome, gives her his dying words The sky is blue. Is there really hope for a better life outside the dome? Wren is determined to find out.