I AM GOING to go out on a limb and say Sims is my favorite young US fiction writer. I am guessing he is still under 40, though perhaps not by much...oh, let's just say he is my favorite millennial US fiction writer.
I say that having read only this, his first collection of short fiction, and his 2013 novel, A Questionable Shape (see post for March 24, 2020), but count me a devotee.
Sims reminds me of David Foster Wallace (with whom he studied at Pomona, it turns out) in his profoundly faithful representations of the tortuous paths of over-thinking--or we might call it an inability to stop thinking, to hit on a conclusion you are willing to act upon. (His novel is based on the story of Hamlet, the greatest over-thinker of them all.)
The collection's brilliant opening story, "House-sitting," about a caretaker of a cabin out in the woods, "Za," about a woman trying to figure what tone to hit and how to hit it in an email to a recently-won boyfriend who is traveling abroad, and "Radical Closure," about a person trying to pick the best spot to write, all track consciousnesses trying to solve problems that grow more insoluble the longer they try to solve them, each contemplated solution blossoming fractal-fashion into new problems.
Crucially, all three of these centers of narrative consciousness are on their own, without a trusted friend to say, "Okay, just stop. Stop now." A Questionable Shape was, among other things, about whether being a friend means supporting a friend in ever more arcane pursuits or instead trying to pull them out of a downward spiral. The characters in these stories (with a notable exception, "Two Guys Watching Cujo on Mute") have no such friend, and so wander deeper and deeper into the labyrinth.
One center of narrative consciousness, that of closing story "White Dialogues," is part of a crowd--he is attending a lecture on Vertigo--but as the lecture is being held by a film studies department in which he has recently been denied tenure, he is as alone in a crowd as one can be, and he gets deeper into a darker labyrinth than anyone else in the collection.