Léon a humble civil servant has the unusual ability to walk through walls however thick they are. One day he falls madly in love with a charming hotel thief by the name of Suzan. In order to impress her he poses as Garou-Garou a dangerous gangster. Mistaken for him he is arrested and sent to jail but he of course leaves his cell(and comes back to it) just as he likes infuriating the prison warden. But despite this wonderful gift he remains shy in the presence of Suzan...