This story starts off with a contradiction:
When Mira sees the library for the first time, it is exactly as she remembers it.
How can one remember what one has never seen before? But such contradictions are to be expected in a story where one character can see the future.
For all that this is a story about pushing the boundaries of time and space, this isn’t SF. Rather, it has a quiet, almost fairy-tale like quality, and what is at the forefront is Mira and Cy and how they navigate a relationship together: Not just how to fit together when one person sees the future and the other moves unexpectedly through space, but how to build a life within those confines that doesn’t end up feeling utterly fatalistic. The lack of free will or free choice that is apparently entailed by foreknowledge of the future — a problem that has been vexing not only science fiction authors but philosophers for millenia — is deftly handled here by Perez in this satisfying story.