I really liked the concept of this book and I think overall it was a worthwhile read. To start with the negatives, I didn't love the characters. There were three main narrators and while this was a great way to tell the story, these characters were a little annoying. This was probably a personal issue, but like every adult female character was super passionate about being pregnant and having children. And while having children isn't a bad goal, when it is every female character, it gets a little frustrating. The modern narrator, Caroline, was not my favorite. I really liked some parts of her character, like her passion for history, but her relationship with her husband was so difficult to connect with. It was a really realistic portrayal, but not an experience I could relate to. She let go of her own goals and ambitions for the sake of her relationship, which happens a lot but is something I cannot wrap my head around. I guess it wasn't a point of view written for someone like me, which isn't the fault of the author. I liked the jumps between time, and the way that this type of narration is able to reveal things in a dynamic way. I think that Nella, the apothecary, was a disappointing character. Sometimes you just want a character to kill bad people without literally dying of guilt, but Nella was more of a realistic portrayal of the way that someone might be affected by these circumstances. Once again, annoying that she was so overtaken by her inability to have a child. While hers is more understandable as she suffered a tragedy and was dealing with the post traumatic stress that accumponies such an event, I wish that her life was less intrenched with the men around her. I liked Eliza, the young girl who makes a connection with Nella. She was a hopeful and curious character who managed to make an important impact in the story even with the lack of understanding she had due to being a child and being pushed asside by the adults in her life.
I had a moment towards about 3/4 of the way into the book where I couldn't wait for it to be over. The characters were acting afool and I was so done with their shenanigans. As it got towards the end, it got better and I enjoyed the end overall. Like I said, the time jumps serve a great purpose in the story telling. It allows us  to learn about the events of the past both with the narration of those characters and through the research of Caroline. I liked the mystery of the story as well and I think it played out in a satisfying way. 
Overall, this book would be a great read, for someone other than me.