Double clique

"LB messed up. Even though her best friend, Kat, says she's forgiven her for that whole using-science-to-make-herself-popular thing, things are still pretty weird between them. Then the bully from their old school, Courtenay, shows up--pretending to be nice! Worst of all, Kat seems to ... like Courtenay? Just when she thought things were getting back to normal, LB's friendships are more confusing than ever! She needs a new hypothesis, and fast, t...