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Misunderstandings create romantic mayhem in this French comedy. Joanna Martin is an investigative television reporter who has lived happily with prominent lawyer Samuel Bosquier for over 15 years. The trouble begins when her station assigns Joanna to investigate the phony marriage/immigration racket. Wanting to prove that such bogus unions are absurdly easy to obtain, she steals the identity of her sister (a spinster) and 'marries" Pavel, a recently emigrated Hungarian laborer. Unfortunately, she says nothing of her assignment to Samuel. He never would have found out had he not run across a letter she had written on behalf of a colleague to help her escape her abusive husband. Reading the letter, poor Samuel begins believing that his beloved Joanna has been untrue. He suffers a breakdown and begins getting in trouble with the law. At the same time, Joanna develops her own problems when a government official begins suspects the reporter's marriage to Pavel is a sham. The dogged official so badgers them, they the two stage an elaborate scenario to prove themselves bonafide spouses.