The Duke & the Vicar's Daughter — Fenella Miller

The Duke of Edbury decides he must marry an heiress if he is to save his estates. So far he has managed to stay out of the clutches of the predatory mothers who spend the Season searching for suitable husbands for their daughters. The goddaughter of his aunt, Lady Patience, might be a suitable candidate, and he is persuaded to act as a temporary guardian to both her and her cousin, Charity Lawson. When Charity and Patience exchange places, the fun begins...