Sublimation by Isabel J. Kim
368 pages, Hardcover
Expected publication: June 2, 2026
Of the most anticipated science fiction novels of the year, this debut is on many radars. This novel didn’t have the standard struggles of a debut. Isabell J. Kim, for one, has won the Nebula, Locus, BSFA, and the Shirley Jackson Awards, and she has a well-earned reputation for really good short fiction, including several you can read for free over at Clarkesworld, including the story that was expanded into this novel. The novel went to Tor in a bidding war and has already sold TV rights to Universal. All amazing things, but there is only one downside.
Major hype puts more pressure on the novel. As I write this review, the official release is months away. I was a little worried that the novel would not live up to the buzz.
The good news is that, yes, the novel is fantastic. Another thing about the buzz, because of the timing and the marketing, which is constantly comparing this show to Severance, it might be easy to dismiss this novel as chasing Severance vibes. Let's keep in mind that Kim first explored this idea in this short story…
More than a year before Severance, you can’t blame Tor for going there, as the Apple TV show is great watercooler SF. That being said, Sublimation and Severance share some conceptual DNA, the tones are very different. Sublimation is not a mystery box; the concept makes it an alternate history in a way. I wish I didn’t have to compare them, but that is the fate of this novel when it is marketed as such.
The more natural comparison for me was last year’s top read, Luminous by Silvia Park, an SF novel by a Korean American author, whose work was shaped by both cultures. Luminous, of course, is a robot novel, but both novels are about immigration, although this one is much more direct.
Sublimation is high concept SF that skirts with Twilight Zone-ish off beat just barely fantasy vibe. I say this because the process of an “Instance” process is almost magically fantastic, but treated in the novel as just the natural way of the world. In the universe of this novel, immigrants who cross borders split into versions of themselves. One that stays home, and one that changes and grows, are separated in a new country. Much like PKD’s Counterclock World, it is more of a surrealist concept than SF, but Kim commits to world-building.
Soyoung Rose Kang became an instance when she traveled across the border. It is an interesting element of the theme that borders become essentially magical portals. Much like PKD’s Counterclock World, it doesn’t help to overthink it. This idea is excellent for exploring themes and not one for readers who nitpick or ask lots of questions.
Rose and her mother left Korea as children. When they crossed the border, they split into two copies, and the old Soyoung stayed behind, living a separate life. Did she become Rose in America, or was Soyoung created to stay in Korea? As Dickian, I love the questions about what is real, who is human, and who is not. Who is living a REAL life?
The story kicks off when Rose is asked to travel back to Korea for her Grandfather’s funeral. She hasn’t been back since she was ten. Rose has become American, but at ten, a version of herself continued to grow up in Korea. Her relationship with her Korean mother is very interesting; it looks and sounds like her mom, but of course, she is different. Rose has some memories of Korea, but America is a mystery to Soyoung. You might be able to guess where this is going.
One way to tell this story might have been to have a person at an agency overseeing multiple cases, but smartly, Kim tells a focused story based mostly on two experiences. It is enough to really highlight how immigration is a part of our fabric. “Instancing is written into America’s blood, into the story it tells itself. Here is where instances immigrate. Give us your tired, your poor, your hungry, give us your copies and let them be fruitful and multiply, let them homestead, let them become titans of industry, let them and their non-instanced children build cities, towns, and railroads.”
The surreal existence of the instance gives the novel a chance to explore with and play with themes that are part of the American experience, high concepting the issues doesn’t exactly bury the issue either. This novel has a point of view.
Much of the narrative tension comes from Soyoung/ Rose dealing with the weird ways their lives are forced into drama by the splitting of their lives. They were one person, now they are two, the same childhood and family but after ten years old two very different people. “It’s not clean,” she says. “I want the sort of clean, perfect separation like we pretend that these last months never happened, with all my memories sectioned off into the right person who needs them.”
It is on the back cover, so it is not a spoiler, but Soyong tries to steal Rose’s life. The parallel stories are much of the story's driving force. The POV shifts often, but it slips gently into second person in certain chapters.
We also get the story of an ambitious instance named Yujin, whose two separate halves work together with separate educations, with the intention of becoming one person later. Yujin’s story is the perfect parallel because Rose and her Instance want nothing to do with each other. Yujin explains his desire to be one, while Rose sees integration as theft.
“So, it’s like – I want to remember being home. Living at home. And Yujin wants to remember ten years of being here. And Yujin wants to skip military service, if he can. And I can’t go back without potentially getting flagged for my own military service. Or becoming him and having to do his- ours?- and this way we get everything. All of it.”
Soyoung nods. “Yujin wants your life. He wants your life, he wants your life. Soyoung wanted Rose’s life.”
Yujin however, was strategic.
“You had gotten the science degree, and Yj had gotten the business one. You agreed to this to maximize your abilities later, after you reintegrated.”
The novel explores plenty of corners presented by the concept. Enough to feed a TV show, but also enough to give the novel plenty of dynamic corners.
“Imagine a world without instances. A world where leaving is a perfect absence, where there is no ghost left behind. Imagine knowing the parallel, leaving the past in the past, a world where desire doesn’t matter, where there is knowledge of the implicit truth of the human heart.”
This is wonderfully opinionated science fiction. The Severance comparison negatively affect readers who are looking for a workplace satire, and since I am the PKD guy, I think Philip K. Dick fans will enjoy the concept. The prose is excellent, and Kim plays with tense and form in many interesting ways. The characters are well drawn and will pull you into the end world enough that you will just go with the more surreal elements. This is a great modern SF novel that deserves attention.




