Bei Oscar ist 'ne Schraube locker!

Oscar (Louis de Funès) and his friend Franz (Maurice Biraud) seem to be normal and well-behaved citizens. But appearances are deceptive, because at night they slip out of their disguise and try their hand at being safecrackers. Unfortunately only with small success, but they do not give up and hope to commit the big robbery one day. When the two are in a tight spot again one day, the well-protected daughter Lucille (Dany Saval) from a good family helps them out of the ink. Without further ado, she makes herself the new boss and together she is now supposed to succeed in the big coup.