A music film whose song, dance and music performances all take place in Helsinki during one summer Saturday.
A technician working in the telephony company receives a mysterious packet.
The unlucky layabout Isarkar Keturi brings a criminal gang to heel with the help of his assistant Mikael. He frees Irma, the daughter of mining magnate Tömstet, from captivity and a forced marriage to Kurt. Irma achieves her dream of becoming a pop star, with Isaskar's help.
