This book was is everything. I want to compare it to when I read TOG, but it's just so much better! My heart is shattered but whole at the same time and I am not okay.

The book starts out with Diana calling a book from the Bodleian library not knowing that it was an ancient, spelled book. Hating that she is a witch and refusing to use her powers ever since her parents death, she makes minimal notes on the book and returns it. Diana believes that's the end of the weird book that called to her, but she soon realizes that by opening it, she set off waves in the paranormal community and now daemons, vampires, and witches are waiting for her to call it back.
Enter our MMC vampire, Matthew, who starts protecting her and quickly catches feelings while they try to discover how she broke the spell on the book.
Everything turns upside down when the Congregation, ruling body of creatures, catches wind of their "closeness". This leads to the beginning of a war, rebellion, secrets being brought to light and so much more.

I absolutely loved everything, and was invested in every single character-side or not. Each character was their own person with a full backstory and life before meeting Diana. The politics and world building were confusing at first, but I'm not a history buff or know a lick of French so google was my bff at times. Granted, there are plenty of context clues to know what's going on or get the gist of what Matthew and his family are talking about, but I'm nosy and wanted to know exactly what was said. I was fully immersed in the world that Deborah Harkness created and I'm sad that there are only 2 more books before it's over. 

I'm still so in my feelings about this book and that absolute cliffhanger that it's so difficult to say anything that does this book justice. Just read it, please.