I liked Mazzola’s The Story Keeper well enough to try another book by her. This one looked interesting.
In 18th century Paris, Madeleine was forced into prostitution at a young age by her mother and so badly scarred by a customer that she now works in the brothel as a maid. She is determined to escape with her nephew, which is one reason she reluctantly agrees to spy for the police on the household of Dr. Reinhart. She is supposed to find out what he is working on, but once installed there, she finds it difficult to learn anything. Something about Reinhart seems off, but he locks up his secrets. However, his interest is in anatomy and he makes elaborate wind-up animals.
A second narrator, Véronique, is Reinhart’s daughter, newly returned from being raised in a convent. Her father has promised to train her in his work, but time passes and he works only with Doctor LeFevre on some project for the King.
Madeleine hears rumors that children are disappearing off the streets and worries about her nephew.
A third narrator is Madame de Pompadour, who is afraid she is losing the King’s affection and worried about what he is up to.
This novel is fast-paced and eventually gets very creepy, but there are some unlikely aspects about it, especially how neatly everything is resolved. Still, it certainly kept my attention.
What? Me Read? 
I’m glad you liked this one, despite the unlikely aspects! I loved the setting and the atmosphere.
The atmosphere was good. I didn’t think it felt much like 18th century France, though.