I quite liked his book House of Suns. https://en.wikipedia.org/wiki/House_of_Suns https://en.wikipedia.org/wiki/House_of_Suns There might be a few aspects tha

I quite liked his book House of Suns. https://en.wikipedia.org/wiki/House_of_Suns https://en.wikipedia.org/wiki/House_of_Suns There might be a few aspects that of the story that push it out of the "Hard Sci-Fi" category; but most of it seems to obey the laws of physics as we understand them.