In Nice, the wealthy widow Betty Farnwell falls for the charms of a handsome young man, Philippe Delaroche. Mrs Farnwell is so taken with Philippe that she persuades her bank to allow him to manage her financial affairs. Philippe, an unscrupulous opportunist, is not slow to turn the situation to his advantage and within no time he is married to his wealthy benefactor. Philippe has barely grown accustomed to wearing a wedding ring when he begins a romantic liaison with his wife's attractive secretary, Eva. It soon transpires that Eva is even more ruthless than Philippe...