The Lost Apothecary

I knew I was taking a risk because even though I love a good secret library book, it's so common for magic and witchcraft to be used to artificially deepen an otherwise dull plot these days. That's what it felt like happened here - the whole failing marriage aspect and then hidden history aspect didn't complement each other well enough to play off each other/together, and neither was well-developed enough to carry itself on its own.