Short, basically novella. Hides some cool worldbuilding in the cracks - and maybe I missed some more.

I like the main character and the seriously generational concept. The book starts in media res, then flashes back for the rest of story. I like these short Tor publications also - and both authors are apparently well known to others, but not yet to me.

That said, there is some time travel - but does the main character do so? If not, where do the memories come from? This part was confusing to me, though maybe I missed the explanation. This meant the ending chapter was doubly confusing, unfortunately.