In this period piece set in England in 1776, Betsy, the eldest daughter of the 'nouveau riche' Sterling family from the city, is to wed Sir John, the son of the aristocratic but poor Ogleby family from the country. However, Betsy's sister Fanny, who has secretly married her father's clerk by whom she is pregnant, quickly becomes the object of attention not only of Sir John but also of his elderly father, Lord Ogleby. Betsy's father, who is not aware that Fanny is already married, secretly agrees to exchange one daughter for the other. Soon everyone is acting at cross-purposes, the immediate concern being how to save face. The Clandestine Marriage is a comedy of errors set against the lush landscape of an English country estate in high summer.