A world frozen for two hundred years, now on the verge of dying. A centuries-old plan to deliver Earth from extinction. Will the deep-space maneuver actually save the planet? Or will it finish off what remains of mankind?
Odessa, a nineteen-year-old MEDcadet, witnesses the murder of her anatomy professor and finds herself in fear for her life. Fighting recurring panic attacks while sailing from her home on Rhone—the fortified ark created by Cerebus—across the Eastern Sea to Earthland, Odessa manages to keep what she's seen to herself. To her horror, however, when the vessel docks, she and her podmates are arrested by the very security force who committed the crime.
Reynal Królik, an eighteen-year-old trading post sled driver on Earthland, longs for Clearsky, though he's never known anything but the gray shroud that darkens the atmosphere. After he and his fellow messengers foil an assassin's attempt to kill Odessa and her companions, he whisks them away, only to discover he and she are tangled up on opposite sides of the same secret mission to slam an asteroid into Earth—one for which Rey will be the asteroid driver.
Rey and Odessa—along with their friends and a dangerous outlaw—race against time to escape Earthland, but can they evade Cerebus' flagship war zeppelin in order for Rey to complete the task for which he was destined? A destiny Odessa was taught to deny and will fight to prevent?