Did not finish at 60%
I’m not actually sure what it is about the books. The writing is fine–it’s overdone in a way that feels ‘Holmesy’ with a Cthulhian creepiness throughout –but I just can’t get it to stick. And then about halfway, suddenly we have a few chapters of a flashback from entirely another set of characters, which I actually enjoyed reading more. But that’s not the book I started to read.
Overall, the first book was a fascinating idea done well enough, but I don’t think it really supported the sequel. So it goes. Feel free to give it a try, perhaps you’ll like it more than I did.