A Kiss for a Killer (1957)

Philippe Delarouche (Henri Vidal) is a banker who sees his mastery of seduction as a more efficient path to riches than the capital markets; after a brief courtship of his wealthy client Betty Farnwell (Isa Miranda), the film's only redeemable character, he marries her but can't bring himself to express any real affection toward her. Betty's younger, sexier secretary Eva Dollan (Mylène Demongeot), however, is a different story, and soon Philippe and Eva are plotting with and against each other for control of the Farnwell estate.