One online review I read for this book says that it has "shades of American Psycho and Fight Club." I find myself inclined to disagree with that.

I also have to say that the trigger warning content hits more like a wet sock than a baseball bat: it's objectively gross on the page, of course, because it would also be gross irl, but there's a kind of lack of subjective grossness to it that makes it fall a bit flat to me. It doesn't FEEL as heinous as it should, it's almost bland in how spare the prose is. That's down to how Irina views it all, though, I think. She isn't affected in the ways you'd expect, so that's how things come across through the lens of her character - they happen, and that's it.

Perhaps I came in with my expectations too high, though. Or maybe it's meant to show exactly how twisted certain events in Irina's life have caused her to become, I'm not sure.

Something Irina's friend Flo tells her sums up what Irina spends the whole book trying to disprove and fight against, from beginning to end: "You want to think you're not like other women, but you are, you know. You're still... that's still how the rest of the world, how men are going to see you."

On a technical note:
It's easy to tell that this is Clark's first novel. I'm wondering how all the semicolons and seemingly excessive commas got through the editing process, because that was a Choice. There are many points in the book where I looked at the construction of the writing and thought, "Why?" 
I've also read Penance, and Clark clearly put in some work to improve her craft during the writing process of that one.