The Wicked King by Holly Black (Folk of the Air 2)

The Cruel Prince, Cardan, has become The Wicked King in this sequel.  After discovering Oak, Jude's brother, is a heir to the throne, Jude installed Cardan to the throne to hold Oak's place.  As she serves as his advisor,  she influences him to make decisions that will favor the best for the kingdom and for her.  She reconciles with Tayrn and Taryn prepares for her marriage to Locke wanting to have Jude there, but Locke is still playing games between the sisters for his own enjoyment.  Through all the deception she comes to find out someone she trusts has betrayed her and she ends up Undersea in prison.  As Cardan and Madoc make a bargain to release her she ends up making a deal with Cardan that ultimately ruins her plans for it all. 

Jude fights her feelings for Cardan throughout this entire book and he fights his for her as well.  Hopefully the next book will resolve that conflict. :) 

Still has violence and a little stronger suggested scene.  I probably would suggest for HS. 

The Cruel Prince by Holly Black (Folk of the Air 1)

Wow! What a ride. The book starts out pretty bloody... Madoc (a faerie) has come to the mortal world to collect his daughter, Vivienne. His wife, a mortal, stole her away 9 years ago and has created a new life that includes twin daughters, Jude and Taryn. Madoc ends up murdering her and her husband and taking all 3 girls to Faerie to live. He raises Taryn and Jude as his own. As Jude tells the story we see the difficulty of growing up mortal in a faerie world. Jude tries to please Madoc and becomes good with a sword and strategy, but he still won't let her fight to become a knight. When Prince Dain approaches her to become a spy for him, she accepts if he will grant her protection from anyone glamouring her to do what they want. As she spies for him she begins to notice he is not the just Prince she thought he was and at the coronation for him, almost the whole royal family is murdered, she begins to devise a way to make sure she has a place in the faerie world as well as make sure a proper king will sit on the throne.

8th and up for violence and some suggested scenes.

Book Scavenger by Jennifer Chambliss Bertman

Books, ciphers, prizes, what's not to love?  Emily's family is on the move, literally.  They are trying to live in all 50 states.  This time they are headed to San Francisco, CA.  She is trying to stay positive because the creator of Book Scavenger lives there.  As they are driving into town, however they see a huge crime scene and she later finds out that Garrison Griswold, the creator of Book Scavenger, was mugged!  As they move into their apartment, she meets James, a kid who LOVES puzzles.  As Emily shares Book Scavenger with him, they begin to puzzle together Griswold's new game.  But the stakes are high because she is not the only one looking for the prize.

Very similar to Mr. Lemoncello's Library.

Greenglass House by Kate Milford

Milo lives in Greenglass House, which is an inn used mainly by smugglers. He is on his Christmas/Holiday Break when they start getting a lot of visitors to the Inn.  It is very unusual for this time of year.  Some come up together, and some alone, but he starts to realize most of them have something in common with each other.  As the mystery deepens, things are stolen, sabotaged, and becoming dangerous.  Milo keeps trying to figure out the answers with his friend Meddy, but will they solve it in time?