Shipwrecked on the coast of Illyria, Viola adopts a male disguise and enters the service of Duke Orsino, only to find herself part of a triangle of unrequited love. Meanwhile, in the household of the Countess Olivia, Sir Toby Belch and his unruly companions trick Olivia's strict and disapproving steward, Malvolio, into believing that she loves him.
