The summer holidays are here and most people are away. Twelve-year-olds Alexandra, Dushan, Tindra and Edvin are left behind, who do not really hang out with each other. Alexandra and Tindra want to go to the rocks and Dushan joins in - even though he absolutely not allowed to by his mother.

Dushan is completely devastated that his bike is gone, but does not dare to tell the truth to his mother. Edvin tells about the Foil Man, who according to Edvin has taken his cat. Now he wants to get the other three on a big revenge mission.

Alexandra and Dushan are camping in the garden and when it starts to get dark, they go to meet Edvin. He will show them the foil man's animal cemetery. But is it really there and will Edvin show up?

Alexandra receives a message from her girlfriend Molly which makes her very sad. The group begins to make a plan for the great revenge against thefoil man. At the same time, Edvin is depressed and he tells Tindra why.

Tindra tells Edvin a secret and he must promise not to tell the others. Things needed for them to carry out the revenge must be bought and Edvin puts Dushan in a difficult position.

The day of revenge is here. But the group is divided and it seems uncertain whether the plan will even be implemented. In an attempt to appear braver than he is, Dushan crosses the line.

Tindra's best friend Yassi has come home from her farm and does not want Tindra to be with her new friends. Alexandra and Dushan feel bad about what happened to the foil man. Their bad conscience takes over and they decide to do something they never thought they would dare.

It takes a lot of courage, but now they stand on the foil man's stairs and ring the bell. Is he really the one everyone thinks he is? The summer holidays are over and the four friends will soon start the sixth grade.