The friend

"Kat and Allie have been friends forever. But when Allie returns from a summer away, everything changes. Allie's different. Too different. She's suddenly afraid of insects. She's friends with popular Veronica Cordey. Worst of all, she doesn't seem to want anything to do with Kat. And Kat begins to wonder: who is this girl and what has she done with her best friend?"--Back cover.