"First published in 2011 by Macmillan Education Australia Pty Ltd."
Summary:
Addie, officially known as Star Girl, is having some trouble fitting in at the Space Education and Action School, but she hopes her second mission will be a success--she and Grace (Comet XS), who does not trust her, must seek out the source of the pollution that is poisoning the intelligent vine aliens on the planet Plantagan.
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