Strictly from a plot point of view, Kay Kenyon's new book resembles some of the old classic pulps, in which a science-fictional devices hurl a hero into a fantastic, semi-primitive environment. I'm thinking specifically of something like John Carter of Mars, except in this case instead of another planet it's another dimension that allows a person to walk to other stars and galaxies. I wasn't really familiar with the term "interstitial" before Alyssa explained it to me, (essentially a combination of more than one genre) but BOTS is a good example of it, because even though this book's plot has an SF "wrapper," once Titus Quinn is thrown into the realm of the Entire, the rules of fantasy dominate.
I should add that the quality of Kenyon's prose is far above pulp writing, as is her character development. At the core of this story is a father whose somewhat irresponsible actions lead to the loss of his family and separation from his child. Though there is a lot of action in the plot, underneath it all is Titus' quest for reconciliation with and forgiveness by his estranged daughter Sydney. Ignoring the part about Sydney being blinded by superpowered demon-gods and enslaved by a sentient horned horse-like species in another dimension, it's a story that is played out every day all over America, and the world.
I'm about halfway through the book, and I'll comment further as developments come along.