Eleven-year-old Kylie’s friends seem so much more mature than she is. And with middle school just a summer away, she’s worried her friends might leave her behind, especially because she keeps embarrassing them. So Kylie applies her scientific brain to solve the problem and comes up with the Everybody Experiment:

Hypothesis: Kylie Stanton will be mature if she does what everybody else does.

Experiment: This summer, when all of Kylie’s friends do something, she will do it too.

Suddenly it’s a whole new grown-up world for Kylie, with parties, unsupervised excursions, and boys. But the more research Kylie puts into the Everybody Experiment, the more she begins to wonder how she can do what everybody else does . . . without letting go of herself.