Above, on the sixth floor, there are a group of Spanish house maids (les bonnes) who might as well not exist as far as Jean-Louis and Suzanne are concerned.
When their French maid is dismissed, because Suzanne and her didn't get on after the death of Jean-Louis's mother, a friend suggests to Suzanne that she should look for a Spanish maid. She duly takes on the recently arrived and very attractive Maria. With a bit of clandestine help from her friends on the sixth floor, the young Maria makes a good impression, and is appointed.
Jean-Louis soon becomes infatuated with Maria. His wife suspects something is going on, but misses the obvious and mistakenly accuses her husband of having an affair with an attractive new female client. He choses to admit to this imaginary affair rather than to his real feelings for Maria. Suzanne duly kicks him out and he moves upstairs to the 6th floor, much to the astonishment of the maids.