Stella Glass dreams of exploring worlds beyond her home of Solace, but when her famous parents are sent on a historic mission to the Uncharted Lands, it’s simply too dangerous for her to join them. By order of the king, she is left behind.

Missing out on the excitement is one thing, but Stella is devastated at the thought of her parents flying into the unknown. So she takes matters into her own hands. Instead of staying with family as planned, she steals away and—right before takeoff—sneaks aboard the airship.

But Stella isn’t the only stowaway.

In the cargo bay is a boy who is also desperate to get to the Uncharted Lands. And someone else who’s determined to keep the ship from making it there at all. . . .