![Tin](http://www.bestbooksforschools.com/cdn/shop/products/9781911077657_5e196a58-50fd-4c5a-af4a-5da8de549afc_{width}x.jpg?v=1620830040)
Christopher is 'Proper': a real boy with a real soul, orphaned in a fire. He works for an engineer, a maker of the eccentric, loyal and totally individual mechanicals who are Christopher's best friends. But after an accident, Christopher realizes he isn't as Proper as he thought ...
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