While trying to find a new best friend after feuding with Rowley, middle-school slacker Greg Heffley is warned by older family members that adolescence is a time to act more responsibly and to think seriously about his future.

In 1955 Hadley, Virginia, twelve-year-old Dawnie Rae Johnson, a tomboy who excels at baseball and at her studies, becomes the first African American student to attend the all-white Prettyman Coburn school, turning her world upside down. Includes historical notes about the period.