I am Princess X by Cherie Priest
Set in Seattle and told partially in graphic novel form, I am Princess X is an intense thrill ride of a teen mystery novel. It's full of smart characters with different skills who have to work together to find the truth. It's perfect summer reading.
Unicorn on a Roll by Dana Simpson
Unicorns are more powerful than tater tots!
Dork Diaries 9: Tales from a Not-So-Dorky Drama Queen by Rachel Renee Russell
I don't think I really have to say anything more about this than that it's here. Oh, and apparently MacKenzie gets her mitts on Nikki's diary and takes it over. Somehow, I don't think she's going to use it for good things, do you?