Man-haters Pamela Gordon, Violet and Kate West, each disappointed in love, vow never to marry, and room together with a sign above their door reading "No man shall cross this threshold." When Edgar Holt enters their room to escape an irate husband whose jealousy he mistakenly aroused, he falls in love with Pamela, but she makes him leave through a window across an ironing board over a courtyard. Edgar woos Pamela but he is unsuccessful in breaking down her resolve, even though she privately softens and develops a love for him. To help her, Edgar secretly gets her a position as a confidential secretary with his firm.
