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Free on Amazon for 27-Dec-16 (US time) only which i think means it will expire around 7pm AEDT.
"Colin Cantwell, designer of the original Star Wars’ Death Star, X-Wing, TIE Fighter and other Starships, is now using his extraordinary imagination to draw you into the future and into another galaxy through his book CoreFires1."
Possibly coincidentally old mate did a Reddit AMA today.