Nathaniel is just a great character.

For me, it was pretty obvious who the bad guy and when Elisabeth figured it out that's when the book get really good. The characters were so well written and dynamic. The world was also so clever with the libraries and the books being magic and the way people procured magic with demons. It was exciting and there were lots of twists. It was fun.

The ending though... is that it?? is there going to be more?? Silas??