The story itself has a distinctly environmental, somewhat preachy message, as each of the children has to complete a task - invariably a test on their personal weaknesses - in order to save humanity. This all takes place in what was their school, but is fast disappearing, as 'nature' rises up to reclaim the world in protest at man's mistreatment of it. Very much reminiscent of the meandering stories that filled endless exercise books in my own childhood, I can see how children might well identify on some level with the naïvely constructed characters and far-flung adventures, although more advanced readers may find it all rather patronising.
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