The Raven Cycle story continues to improve with each book. The first two books, The Raven Boys and The Dream Thieves, served to set up the world and get to know the characters.

The Good:

The plot moved forward at a quicker pace in this installment of the series. The story of Blue's missing mother added suspense.
We get to know the characters even more in this book.
Blue and Gansey's budding relationship. It is so slow and subtle that it is beautiful.
The cover is gorgeous.
The cliffhanger at the end!

The Not So Good:
I don't fully understand Piper's role in the story. When she was introduced, I was a bit confused, and the confusion did not clear up by the end of the book.
The plot can get a bit confusing at times.