Karla met Jonas during a summer vacation at the lake. After being unable to stop thinking about him and their kiss she phones him, making up a school assignment about children living in an orphanage, which is precisely where Jonas lives.

A group of boys start to harass a schoolmate after they misinterpret his behavior at school.

The 12-year-old Oliver discovers that his grandfather used to be a monster hunter and is keeping a shadow monster locked up in his secret cellar. When the shadow monster accidentally escapes, Oliver and his younger brother Lasse have to follow their grandfather's instructions and enlist their friends to catch the monster and bring it back - before it is too late! »Monster Busters« is based on an idea of the universe in the children's book series by Jacob Weinreich.

Karla invites Katrine to spend the holidays with her, hoping they might become best friends. As it turns out, nothing goes as planned. Karla meets Jonas and falls in love for the first time, and she nearly forgets all about Katrine. However, the two girls are forced to put their difficulties aside for a while, as they join Jonas in exposing a local gang of thieves.