A man's body is found on Tähtitorninmäki in Helsinki. Palmu starts to investigate the case, but the scandalous newspaper story causes problems for the police.
A closed room mystery begins when an infamous tycoon is found dead in his bath tub. The famous police lieutenant Palmu is summoned to investigate.
A rich widow is found dead in her apartment in Helsinki due to gas poisoning. The incident is initially thought to be an accident, but inspector Palmu notices that the murderer made a mistake, and so Palmu, Kokki and Virta begin the investigation: who had come to the apartment through the balcony door and opened the gas tap while Mrs. Skrof was asleep?
