Twins Viola and Sebastian both get into a shipwreck and both think the other is dead.
Viola decides that in order to mourn the loss of her brother she should refrain from getting married and get a job. She decides to dress up as a man (and go by the name Cesario) to see if she can get a job for the duke of Illyria, Orsino.
Viola gets the job. She soon falls in love with the duke, but this is a problem considering he doesn't know that "Cesario" is a women.
All of the characters end up getting into a very complicated love triangle. Orsino AND Malvolio loves Olivia who is in love with "Cesario". "Cesario" is in love with Orsino, while Maria loves Toby
One day Malvolio is strolling through the gardens when he finds a love letter from "Olivia". The letter was actually written by Maria as a practical joke. Malvolio reads the letter in which it says that Olivia loves the color yellow, she actually hates it. Malvolio rushes to her room to confess his love in bright yellow stockings with cross-garters and makes a complete fool of himself.
At the end, the truth is revealed and everyone marries their true love.(From left to right) Maria and Toby, Olivia and Sebastian, and Orsino and Viola.