This time, the Heffley's are off on a road trip! The chances of survival are... quite small to be honest. Greg's idea of a good summer is air conditioning and lounging in front of the television. But his mum has different plans. So, they're off on an 'authentic' summer, trapped together on a road trip. And Greg's soon battling petrol-station bathrooms, crazed seagulls, a fender bender and a runaway pig. It looks like he was right to be worried.