Diary of a Wimpy Kid: The Long Haul

As Greg Heffley's summer vacation begins, his mother announces that the family will be going on a surprise road trip. As they pack their suitcases for the trip, Greg's father brings his old boat, towing it behind the van as so to fit luggage.

After a day of driving, including some road trip games and a Spanish lesson, the Heffleys stop at a run-down motel. Greg and his brother Rodrick visit the hot tub, which is already in use by another family. Later on, Greg's sleep is disturbed by a group of kids riding on a cleaning cart, whom he recognizes from the hot tub. He yells at them and is intimidated by their father, then quickly returns to his room. The next day, the Heffleys visit a county fair. While driving, Greg notices the family from the motel in a purple van and nicknames them "the Beardos" after their father's notable beard. At the fair, Greg's little brother, Manny, wins a live baby pig from a contest. The pig stays in the back of the van with Greg.

At a hotel the next night, the pig eats and drinks food from the minibar in Greg and Rodrick's room, costing them money. Greg's father has to take a business call during the drive and needs everyone to be silent. After a chain of events, including the pig biting Greg's finger, Greg's parents donate it to a petting zoo, which upsets Manny. After Greg is taken to a veterinarian for treatment for the pig bite, the family stops at another hotel.

In the morning, Greg's mother takes the family to the beach for the day. As Rodrick drives the van on the bridge, Greg feeds a seagull one of his snacks, causing a flock of them to fly into the car. Panicking, Rodrick accidentally presses the gas pedal and ends up hitting the car in front of them. They learn from a mechanic that their minivan will take hours to fix, and go to a nearby water park to spend time.

Greg's parents put their wallets and cell phones in a locker. After Greg is pranked by Rodrick and has a misunderstanding at a raft ride, he goes back to their chair, finding that it has been taken by the Beardos. Greg chooses not to confront them and goes back to his family at the snack bar. As they prepare to leave, they realize that they have lost the key to their locker. After a failed search, Greg remembers the locker number, '929', and asks an employee to unlock it. The Heffleys find that the locker is empty, and Greg assumes that their belongings must have been stolen by whoever found the key. Greg tells his family about the Beardos and tries searching back at their beach chair, but notices that the Beardos are driving away.

The Heffleys get their car back from the mechanic, but since Greg's parents have left their wallets in the locker, they are unable to pay him. He advises them to turn the heater on to prevent the radiator from breaking. As they get closer to their house, they notice the Beardos' van outside a motel. Greg sees the family leave their room, forgetting to lock the door. The Heffleys charge in to find their belongings, but get distracted instead and utilize the Beardos' items for themselves. As Greg's father is using the bathroom, the Beardos return. He distracts them long enough to get away from the hotel. However, since the car's heater is not on, it breaks down and one of the tires goes flat.

Greg notices a purple van approaching, and the drivers turn out to be two Spanish-speaking men who try to help. Manny speaks perfect Spanish, having learned from a Spanish CD played during a car ride, and convinces them to drive his family to the petting zoo, where he gets the pig back.

At home, Greg has to adjust to living with the pig, his parents get new credit cards and cell phones, and the boat is given to the Spanish men for their help. While unpacking, Greg finds the key from the water park in his shorts, with the number "292." He realizes he had mistakenly claimed the locker number was "929." Greg is not sure what to do and does not want to get in trouble with his parents, writing, "[I]t's hard to see this story having a happy ending.". ⠀⠀⠀⠀

Common Sense Media gave the book four out of five stars.[2]

A film adaptation of the book, starring Jason Drucker as Greg Heffley, was released on May 19, 2017. The film had some differences from the book. For instance, in the film, the trip was aimed to go their Meemaw's house for her birthday, and also added the PlayerExpo event. And the minivan in the book looked like a 2001-2007 Dodge Grand Caravan but was replaced with a 2010 Toyota Sienna instead.

• Diary of a Wimpy Kid: The Long Haul on the series' official website.