Vicky de Berlin, a female gangster, haunted by wartime memories , runs a floating night-club in Brussel. Marcel, her partner and lover, is in charge of the banknotes forgery manufacture concealed in the bottom of the boat. He decides to rob the Bank of Belgium and exchange a huge sum of counterfeit money for its equivalent in genuine one. But things get complicated when Yoko, the she leader of another gang and her lover The Bug interfere...

During WW2, a posh bourgeois woman (Morgan)is compelled to live under the same room as a crude simple-minded yet big-hearted man.(Bourvil) Her husband was arrested by the Gestapo and she is a hunted woman.