It's a brand-new year and a brand-new journal and Greg is keen to put the humiliating (and secret!
Greg's dad, Frank, is on a mission - a mission to make this wimpy kid, well, less wimpy. All manner of 'manly' physical activities are planned, but Greg just about manages to find a way out of them. That is until military academy is is mentioned and Greg realizes that he's going to have to come up with something very special to get out of this one . . .
Greg Heffley finds himself thrust into a new year and a new school where undersize weaklings share the corridors with kids who are taller, meaner and already shaving. Desperate to prove his new found maturity, which only going up a grade can bring, Greg is happy to have his not-quite-so-cool sidekick, Rowley, along for the ride.