Yoon Ha Lee's Ninefox Gambit, the first volume of the Machineries of Empire trilogy, is a mindfuckingly brilliant piece of work.
It is a story told many times before, of rebellion and war and political intrigue and the battle for hearts and minds, but never told in such a casually alien way. Lee drops us into a universe that does not work the way ours does, a universe built not on physics and facts, but mathematics and belief, into a political environment where a rebellion in which a heretical calendar that has been adopted in one captured fortress changes the way that technology works in the space around it, where the essential skills needed to fight the rebels are not just leadership, tactics, and battle skills, but intuitive mathematics and the ability to think flexibly while maintaining total loyalty to the ruling hexarchate and the consensus reality enforced by the orthodox calendar and the rituals that derive from it and structure every aspect of life.
Kel Cheris - Kel being her designation as one of six personality types recognised by the hexarchy - is that rare person, a battle commander who can function with originality within the rigidity of her society, who can recalculate the equations that shape reality within a hair's breadth of heresy without crossing the line.
But Cheris is young, and has never commanded a large scale operation. To face the calendrical rot spreading out from the rebel base in the Fortress of Scattered Needles, Cheris will need the strategic skills and experience of a long dead mad general whose consciousness has been preserved, whose advice can only be accessed by grafting his personality to her own - and whose secret agenda may result in her destruction.
I can not begin to give the alienness of the hexarchate's universe a fair description. The book must be read, the universe entered wholeheartedly, to experience what Lee has done in his worldbuilding in this novel. Yet at the same time, the humanity and depth of the characters makes the strangeness real, even if it is never quite understood.
A truly astounding first novel.