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As a young girl, the exiled princess Laya was forced to leave Hawaii and was raised in France. She discovers that she looks like the Parisian revue star Suzanne Provence and decides to return to her homeland incognito, disguised as Miss Provence. She is accompanied on her journey by the famous clown Jimmy Boy.

Emma Klink is devoted to preserve morality in 1912 and she is also a chairwoman for "The support for unmarried mothers". Her husband is a mustard manufacturer who has had a secret affair with a Spanish dancer twenty-five years earlier. His mistake is that he confides in a semi-senile vicar, and when a strange young man suddenly appears shouting "Daddy!" chaos enters the once peaceful house.

A famous industrialist is murdered at a restaurant in the city of Malmö. Police inspector Martin Beck from the city of Stockholm gets the case. The suspects lead to people involved in illegal arms deals. But who was the biggest criminal, the murderer or the industrialist?