Diary of a Wimpy Kid · #21

Fight or Flight

Jeff Kinney

9.1 / 10
30 expectations

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. Will Greg throw in the towel―or go down swinging?

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.

Published
October 20, 2026
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