Upper-middle-class housewife Judith Wynter (Margaret Leighton) has a closely guarded secret: Under a pen name, she's a best-selling author of steamy bodice-rippers. As her beloved husband, Roger (Ralph Richardson), convalesces from a serious illness, the couple's new driver, Carlo (Carlo Justini), discovers Judith's latest manuscript about an unhappy housewife's passionate affair with the family chauffeur. He jumps to conclusions that create increasingly awkward situations for them all.