Bert writes diary for each day during this calendar year, and most notes depicts what happened yesterday.

The book cover depicts Bert, running around in his untidy room wearing only underpants, and holding his diary in his hands.

After Bert and Åke have been jumping next to the fire during Walpurgis Night, the Heman Hunters demonstrate on May Day, but are removed after singing "Tupp fick kramp uti magen, sista skiten kom där" ("rooster got cramp out in its stomach, the last shit came there") to the Internationale tune.

On the night between 5 and 6 May, a fire occurs in Bert's hometown, destroying the potato warehouse " Arnes potatislager ".

Following tradition, Bert and his relatives spend Midsummer in Babbsand, inside a cottage located on an island.

When Bert hears of communists not being allowed into the US, he turns afraid when he knows his neighbour Olle Collin votes for VPK.

The problems turn worse when Paulina's cousin Pavel from Czechoslovakia, a USSR ally state, is visiting Sweden.

Bert now must shows his support for the US, and calls the embassy of the US in Sweden, singing "Happy Birthday to USA", but the staff takes it for Russian folk songs.

The local newspaper depicts the event as a youth communist demonstrating outside McDonald's by desecrating and burning the flag of the US.

Then, they visit Jamaica, and during the home trip a drunk man from Finland is almost thrown off the aeroplane in Iceland.

In August, Bert spends a lot of time with his friends, before the 7th grade starts, including taking apples from foreign gardens.

The book ends with Bert doing his homework, and his mother says time has run so fast since his parents came home with him from the birthing center, and she wants to kiss him.