Dr. Henry Harriston is a successful psychoanalyst in New York City. When he is near a nervous breakdown, he arranges to change his flat with Beatrice Saulnier from France for a while. Both don't know each other and both find themselves deeply involved into the social settings of the other, because the decision to change their flats is made overnight. Could be the perfect amusement, but suddenly Henry finds himself beaten up by Beatrice' lover and Beatrice is considered to be Dr. Harriston's substitute by his clients...