Booklist: May and Libby came up with Princess X, a katana-wielding cartoon girl with a crown and red Chucks, on the day they met in fifth grade, and for the next several years of their friendship, they wrote enough stories about her to fill a closet. But then Libby and her mother die in a car accident, and May tries to move on with her life, but she can’t shake the feeling that not everything adds up about Libby’s death. Three years later, May notices a faded vinyl sticker that is unmistakably Princess X. Then she discovers a webcomic about her, which includes characters that look alarmingly like Libby and May, and clues that only May can decipher. With the help of her tech-savvy neighbor, Trick, May looks all over (and under) Seattle to uncover the truth about her best friend. Interspersed with Ciesemier’s webcomic-style illustrations, Priest’s YA debut is an engrossing cyberthriller packed with a puzzling mystery, crackerjack detective work, and an eerie, atmospheric sense of place. The unembellished style is a perfect match for the noir-lite tone, and May and Trick, whose banter crackles with energy, rival any team of gumshoes out there. Teens who roll their eyes at adults out of touch with Internet culture will eat this up.