Like in the "The Unseen", this features a dual timeline story, which is always one of my favourite tropes, but in this novel, it felt flat, especially during the modern timeline, it was interesting enough, but It didn't "fit" the rest of the atmosphere, it just seem to drag the story, not adding anything new.
The whole book is very detailed and compelling, but it could've been a little shorter. There're various interesting historical elements throughout, like the suffragist movement, but the story did slow down significantly in the middle.