Being a kid can really stink. And no one knows this better than Greg Heffley, who finds himself thrust into high school where undersized weaklings share the hallways with kids who are taller, meaner, and already shaving. Luckily Greg has his best friend and sidekick, Rowley. But when Rowley's popularity starts to rise, it kicks off a chain of events that will test their friendship in hilarious fasion.