Nicole, engaged to a renowned lawyer, has taken into her head to re-educate a tramp nicknamed "L'Anguille". To thwart what he considers a mere fad, Maître Lion, the fiancé, hires a young engineer whose assignment is to pose as a tramp. While playing a game meant to discourage the self-appointed social worker, Roger can't help falling in love with Nicole. Good for them but bad for the fiancé, whose rage and spite are no match for true love.