Sebastian (Viola's twin, thought to be dead) comes ashore in Illyria. He thinks Viola has drowned in the shipwreck. A man named Antonio has rescued him from the surf; at some risk to himself, because Antonio fought against the Duke at one time. Meanwhile, in Olivia's house, Sir Toby Belch (her cousin) has tricked Sir Andrew Aguecheek into supporting him, by convincing him that he could be a suitor for Olivia. So with the help of Maria, Olivia's maid, and Feste, a clown, Belch plots to make a fool of the steward. Maria writes a love letter to Malvolio that will make him think Olivia has fallen for him. Malvolio falls for the joke and dresses crazily as the letter says to. Not knowing it is a joke, the Countess is horrified and has Malvolio locked away as a madman. 