After a wealthy, bored heiress (Fanny Cottençon) botches up a custody battle between a taxi driver (Francis Perrin) and his ex-wife by getting the driver jailed for no good reason, she has second thoughts - especially since she starts feeling an attraction for the hapless man. She suggests that they pretend to be married and in that guise, try to win back his son from the ex-wife - and romance blossoms from there.