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A new author in the Diary of a Wimpy Kid series is Rowley Jefferson! Greg Hefley, Rowley's best friend, has written thirteen diaries recording his adventures in high school... and he's not going to stop there. But the time has come for Rowley to listen, and he's decided to follow suit.

In Diary of a Wacky Kid, Rowley describes his own experiences and agrees to play the role of Greg's biographer. (After all, one day Greg will be rich and famous, and everyone will want to know his life story.) But Rowley isn't the best choice for the job, and his "biography" turns into a hilarious mess. But who would want to miss the opportunity to look at the world of Wimpy from a different perspective?