I really love the way the series is progressing.
This books has a bit more angst as Blue is worrying over her missing mother and her feelings for Gansey are getting harder to keep at bay. I love that was there was some growth from Adam who has finally realized what an idiot he has been. Ronin is...well Ronin. He's a jerk, but he's a loyal jerk who cares about his friends more than he'd ever admit. And I love Jesse Dittley and the fact that he nicknamed Blue, 'Ant'! There are a few more characters in this book, but the main cast of characters does not get lost in the story, which is fantastic writing.
They've made progress in finding the Raven King as well as Maura, but things are getting ever more dangerous for the group. All-in-all this was a great continuation of the series, and it sets up for the next book beautifully.