Unfortunately, my opinion of this is tainted by the poor quality of the audiobook and most of my review is based on that.
They have two different narrators (one male, one female) and neither are in the right profession. The male reads this like it's a textbook, even when doing ridiculous accents. The female was a bit better, with actual inflection and a better attempt at accents, but still Not Good. The different ethnic accents were a poor choice on the director and/or actor's part and it was difficult and painful trying to get through this.

As far as the story, I was unimpressed. It reminded me a bit of Bardugo's Six of Crows duology in plot/idea but with a much poorer execution [edit: looking at other reviews, I'm far from the only one though I didn't read any reviews before starting]. If I had read this first, I might be more impressed, but the whole multi-ethnic spy ring with magic is now not a new idea.

Overall, it was fine, but not worth the hype it got and definitely didn't make me want to seek out the author's other work.