Sublimation by Isabel J. Kim
My rating: 4 of 5 stars

Good conceptual SF, in that it goes down a strange path and explores all the instances that might come from it.

Or rather, a specific kind of instance. And I use that term intentionally, for that's what happens to some people who cross borders in this alternate Earth. They split, become two people living lives, one on each side of that border.

The consequences are fascinating. But don't expect a thriller or a geopolitical SF out of this. It's very much an interpersonal novel. One that delves into national identity, cultural identity, and while that isn't set up to explore politics or nationalism, it is perfectly situated for the massive consequences of simple life choices and the vast differences you'll find between staying and leaving loved ones.

I can't help but focus on anyone who is and isn't native born, no matter where they wind up, and how it really messes with you.

The SF portion goes one step further, however. What happens when you repatriate your two selves? Two lives, as one? Fun stuff.

Definitely worth your time.

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