In this hilarious ninth Diary of a Wimpy Kid book, Greg Heffley's family embarks on a disastrous summer road trip. Their plans for a fun vacation quickly fall apart as they face car troubles, bad weather, and endless family bickering. Greg documents every cringe-worthy moment in his signature journal style, from annoying little brother Manny to his embarrassing parents. Through all the chaos, Greg learns that sometimes the most memorable adventures are the messy ones you share with family.