Annibal Onnis, a good man and major laundry manufacturer, has his wife's necklace stolen by a young starlet, Regina Rex, who has tried to seduce him. He hires two private detectives, Willis Sr. the father, and Willis Jr. the son, to track down the young woman. Tracking her down in La Baule at a beauty contest, Willis Jr. falls in love with Liliane, known as Régina Rex, and sets out to clear her name, convinced as he is of her innocence. After several comic twists and turns (including the temporary
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