The villagers of Ploverleigh are celebrating the marriage of Alexis, son of Sir Marmaduke Poindextre, to Aline, daughter of Lady Sangazure, who just happens to be Sir Marmaduke's old flame. Alexis is determined that all shall share the purity of his true love. He has arranged for Mr. Wells, "a dealer in magic and spells," to administer his best-selling love potion to everyone in the village, including the vicar Dr. Daly. The result is hilarious confusion.