Set in London, 1851. After Miss Scarlet Warden proves to her sister that her husband is being unfaithful, word spreads. Soon Scarlet is getting calls from her other female friends begging her to spy on their husbands. To help them, Scarlet goes undercover as the governess in various households in her quest for the truth. Guilty men soon fear her, but Hugh Henry Hamilton, the Duke of Danescliffe, agrees with what Scarlet is doing. When Scarlet is accosted, Hugh takes is upon himself to watch after her. It does not take long for the duke to decide that Scarlet is the only lady for him.