Piper has never seen the Mark of the Dragonfly until she finds the girl amid the wreckage of a caravan in the Meteor Fields.
The girl doesn't remember a thing about her life, but the intricate tattoo on her arm is proof that she's from the Dragonfly Territories and that she's protected by the king, which means a reward for Piper if she can get the girl home.
The one sure way to the Territories is the 401—a great, old beauty of a train. But a ticket costs more coin than Piper could make in a year, and stowing away is a difficult prospect—everyone knows that getting past the peculiar green-eyed boy who stands guard is nearly impossible.
Life for Piper has just become dangerous, a little bit magical, and very exciting—if she can manage to survive the journey.