Cast ashore in Illyria after a shipwreck, and sure that her twin brother has drowned, Viola disguises herself as a young man, Cesario, and becomes a page to Duke Orsino. He sends her to woo the Countess Olivia on his behalf; Olivia falls for the messenger, Viola falls for Orsino, and below stairs Olivia's household plots to make a fool of her pompous steward, Malvolio.