Twins Viola and Sebastian are separated by a shipwreck. Viola lands in Illyria, where she disguises herself as a man and enters the service of Duke Orsino. Orsino sends her to help woo the Lady Olivia, who doesn't want the Duke, but finds she likes the new messenger. When Sebastian reappears, with Viola now his exact double, merry hell breaks loose. Meanwhile, Olivia's uncle and his cohorts are trying to find some way to get back at Olivia's officious majordomo, Malvolio.