The director of a private institution is the father of seven charming young girls. He has money worries. A rich bachelor, still young, a few years ago advanced him a large sum of money. He makes frequent visits to his debtor; the poor father, as mediocre a psychologist as he is a poor businessman, hammers himself in his head, not guessing that the visitor is reluctant to make his choice between the seven sisters.

Gilbert Quercy, 18, tried to commit suicide after a heartache. At the hospital, three women try to cheer him up : the three former wives of his father, an archaeologist and an egyptologist, whom Gilbert called his "mothers". These women show a lot of willingness, but soon will become intrusive.