Anderssonskans Kalle is the typical 'Söderkis'. It's a boy growing up on Söder in Stockholm and he is very fond of practical jokes. His mother sees him as a good natured boy but his victims, mostly the local policeman and two old crones in the same house, see him as the devil himself.

A man comes to Stockholm's central station. He does not know who he is or where he has been. He has some keys and a phone number. Perhaps he is the escaped sex maniac the police are searching for. A waitress at a café tries to help him.

There is a new English teacher in school, Miss Lind. She moves in with the Nilssons, whose son Sigge prefers playing with his trumpet than to study German. Miss Lind convinces him how important his studies are. But Sanna, a girl in Sigge's class becomes jealous and angry when Sigge prefers his homework instead of her. Plot by Mattias Thuresson.

A Norwegian scientist builds a device that can convert sound waves into electrical energy. However, the machine is stolen by the scientist's wife and assistant, who head across the frozen tundra towards Russia. A police inspector and a local girl team up with the scientist to help recover the device.