Greg Heffley is about to learn that surviving middle school is no easy feat.

In Fight or Flight, the 21st book in Jeff Kinney’s globally bestselling Diary of a Wimpy Kid series, Greg's hard-earned expertise on navigating the rough-and-tumble world of middle school is put to the test.

When a secret binder filled with Greg’s notes on the school’s biggest bullies falls into the wrong hands, his world quickly begins to unravel. Now it’s a race against time before the truth comes out. 

Luckily for Greg, his best friend, Rowley Jefferson, takes karate, so at least Greg’s got someone in his corner. But an unexpected twist makes Greg realize he’s facing an uphill battle.

Will Greg throw in the towel—or go down swinging? One thing’s for sure—Fight or Flight is a knockout!

A hilarious read for kids ages 8-12, packed with classic Wimpy Kid humor, unforgettable middle-school drama, friendship twists, and Jeff Kinney's signature illustrations.