Diary of a Wimpy Kid: Rodrick Rules is a children's novel by Jeff Kinney, based on the FunBrain.com version. It was released on February 1, 2008, and is the sequel to Diary of a Wimpy Kid. The book is about Greg Heffley, a middle schooler who tries too hard to be popular. The story focuses on Greg's relationship with his older brother, Rodrick, and the chaos that ensues when Greg's secrets fall into Rodrick's hands.