I Am Princess X by Cherie Priest
Suddenly May begins seeing I Am Princess X stickers all over Seattle, and even discovers a whole I Am Princess X webcomic online. This can only mean one thing: her best friend, Libby, from fifth grade is alive and didn’t drown in a car crash. Where has she been hiding all these years and why? I Am Princess X is part mystery, part graphic novel, and all cyberthriller.