Twins promised to a monastery as payment for a political favour, in a world where children are raised without an assigned gender and choose for themselves when they are ready.
That premise sits in the background rather than being the subject, which is the right call. The foreground is a slow family and political story about one sibling joining a rebellion against their mother.
Novella length covering about thirty years, so it moves in jumps. The compression works.
Read December 2017.