Greg Heffley had hoped to have an exciting summer break from school but instead finds himself doing boring activities like going to the public pool with his family and sitting around. His relationship with his brother Rodrick is difficult as Rodrick tries to embarrass him. The book follows Greg's summertime adventures and misadventures, including weird movies, rides and having to spend time with his annoying younger brother Manny. Overall, the book provides some laughs about a middle school boy's less than ideal summer.