[1] It tells the story of Bert Ljung from 27 August to 6 November during the calendar year he turns 12 during the autumn term of the 6th grade school in Sweden.

The book cover depicts Bert and his friends standing at the schoolyard.

Bert begins the 6th grade, and is second oldest in his class afterLisa, and his friends soon start the gang Becka Boysen' to control the local candy trade.

Bert also wonders what she is doing with Rasmus, a guy she plays music with.

Bert's grandmother meets a new man, Henry, and the Ljung family's car breaks apart.