A new school year has begun. 13-year-old Greg Heffley now goes to junior high school, which is about the stupidest idea of all time. There, children, fresh from elementary school, are thrown together with
giant gorillas that have to shave twice a day. And everyone's surprised there's so much fighting going on. Such a life as a teenager is full of unexpected dangers and funny misunderstandings. So Greg just starts
to write down in his diary what he experiences and what gets on his nerves. First and foremost there is his stupid buddy Rupert, who can sometimes be quite embarrassing. However, as Rupert's popularity at school
suddenly rises, Greg tries to take advantage of it - 1st place on the New York Times bestseller list!