I didn't read this in the original French - rather the translation by Sarah Ardizzone. How much that colours my opinion I can't say.

It's a lovely, fantastical story. The imagery is vibrant and original. I liked that the ending wasn't particularly happy - I've a masochistic liking for miserable fairy tales. 

The only thing that prevented me giving it five stars was that, every so often, the book hit a sour note. I'm a fantasy reader by preference, and I'll happily follow every weird, wonderful line down the rabbit hole, but there's a difference between imagination and indulgence. The Jack the Ripper episode didn't, to me, fit with the rest of the book, and there was the occasional image that veered into purple prose and needed to be pulled back. A little more judicious editing would have helped, I think, but overall a thoroughly enjoyable read from an author I'll definitely come back to.