When Greg Heffley's dad threatens to send him to military school if he doesn't stay out of trouble, Greg finds all-new ways to land himself in the doghouse! For starters, Greg's in over his head when he pretends to work at the swanky country club where Rowley's family has a membership. Things don't go much better on a father-son camping trip with the Wilderness Explorers, and then there's the Heffley's new dog, Sweetie, who fetches even more trouble...

Collects the diaries of middle-schooler Greg Heffley as he faces the challenges of school, deals with his annoying older brother, and misses the comforts and conveniences of modern life when his town voluntarily goes electronics-free.