Twelfth Night, by William Shakespeare
Separated in a storm at sea, twins Viola and Sebastian are washed ashore on different parts of the coast of Illyria, each believing the other to be drowned. To protect herself in this unknown land, Viola disguises herself as a young man, Cesario, and enters the service of Duke Orsino. Viola’s male disguise proves all too effective, however, when Orsino employs her as a go between in his persistent love-suit to the unresponsive Countess Olivia; for Olivia, while still disdaining Orsino, falls immediately in love with his emissary.
Meanwhile, Olivia’s uncle, Sir Toby Belch, the maid Maria, the hanger-on Sir Andrew Aguecheek and the clown Feste play a practical joke on Malvolio, Olivia’s self-righteous steward. Tricked into thinking that Olivia is in love with him, and acting on what he believes to be her instructions, Malvolio makes such a fool of himself that he is confined as a madman. Confusion reigns until Viola and Sebastian are reunited, Malvolio is freed and all is explained.