I REALLY love the worldbuilding of this standalone book; with the Grimoires and Great Libraries? Amazing. I love Nathaniel's response to everything that remotely inconveniences him is sarcasm, Elisabeth's stubborn hardheadedness and love to protect the Grimoires and Nathaniel? Let's not forget Silas' complete lack of interest with everything and anyone but Nate and Lis.
Overall — would 100% reread