Life was better in the old days. Or was it? That's the question Greg Heffley is asking as his town voluntarily unplugs and goes electronics-free. But modern life has its conveniences, and Greg isn't cut out for an old-fashioned world. With tension building inside and outside the Heffley home, will Greg find a way to survive?

On their a cross-country camping trip, Greg Heffley and his family find themselves stranded at a Recreational Vehicle park that's not a summertime paradise. When the skies open up and the water starts to rise, the Heffleys wonder if they can save their vacation, or if they're already in too deep.