In this French comedy, one little white lie leads to a series of whoppers as a Frenchman visiting London soon discovers. The French fellow has gone to London with his friends to catch a soccer match. He then must go to the dentist where, just for fun, he puts on a British policeman's uniform. Dressed as a bobby, he scares away some robbers. Unfortunately, he cannot tell them the truth because he is embarrassed to open his mouth and reveal the two teeth he lost at the soccer match. A chase ensues.