Ninefox Gambit by Yoon Ha Lee

This book was such an interestingly different future that after a few chapters I had to pause and check–was this a fantasy? Soldiers marching and formations that almost magically shield their members… I thought that we might have slipped into fantasy or an “indistinguishable from magic” space fantasy. But after Cheris calls in artillery and returns to the starship, some of the technology begins to feel familiar. It’s still not all familiar–there’s real invention, and not limited to any one field. One cool aspect is that on the fly mathematical calculations are required to tweak formations, and that math and geometry continue to perform important roles… despite never bogging the reader down in the equations.

Cheris is soon caught up in intrigue, promoted to terrific responsibilities… and saddled with a ghost. The world makes sense and flows with a strong semblance of order; it’s the way it is for tedious reasons that would bore us. Except that those tedious underpinnings often prove to be less stable and more interesting than you’d think.

It turns out that this is the first book in a series; I’m interested in seeing where it goes.