The Paris Librarian

Hmmm... i let this one sit for about a week after reading it. Murder mysteries is one of my favorites, but I would not recommend this one. It was a recommendation by a barista in a Barnes&Noble Starbucks, who said she loved it. It followed all the prescriptions of the genre, but was long on plot and short on depth and interest.
[Interrupt for a general announcement: this is the third time I type this review because I lost the first two. WTF, Goodreads?]
1) Protagonist detective is likable enough.
2) Other characters were fine but almost none was truly three-dimensional or had lives of their own, other than in the service of the plot.
3) Props to the author for strong women, a character trait sketched very superficially, and which made the lack of depth even more annoying.
4) The writing was smooth enough, to the point where I'm wondering if it was authored by a human or a Google DeepMind AI?
5) Most annoying was that each French phrase, clearly added for atmosphere, was translated into English, which was nearly obnoxious and interrupted the train of reading. If you're going to use French but not trust your readers to figure it out (most of these were no more than 5-word easy, obvious phrases), then don't bother.
So... no P.D. James here, nor even Agatha Christie or any of the other grand dames of crime.
I finished it because—inertia—and give it a solid meh.