Diary of a Wimpy Kid - Rodrick Rules (Blue) is the second book in Jeff Kinney's popular series. The main character, Greg Heffley, continues to share his daily life and the challenges he faces at school and at home. This time, Greg's older brother, Rodrick, plays a significant role and tries to make his life even more difficult. The book is filled with humor and amusing illustrations, making it particularly appealing to children and teenagers.