- ISBN: 9780062311870
- ISBN: 0062311875
- Physical Description: 1 online resource (361 pages) : illustration.
- Edition: First edition.
- Publisher: New York, NY : Greenwillow Books, an imprint of HarperCollinsPublishers, 
|Summary, etc.:|| As apprentice to his father, the second-best medical scientist in the empire, Jonathan leads a quiet life in a remote aerial city until the king arrives, calling on them to find the cure to a plague that has struck the capital city and put the queen's life at risk, but the newly discovered chemical, fantillium, that may help will also put at risk all that Jonathan holds dear.
|Source of Description Note:|| Print version record.
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Young adult fiction.