Orsino loves Olivia (unrequitedly). Twins, Viola and Sebastian, are shipwrecked. Viola disguises, works for Orsino, and Olivia falls in love with them. Olivia’s dr-uncle and friends trick Malvolio into thinking Olivia loves him. Olivia (confused) marries Sebastian. Twins reunite, Malvolio’s gulling and Viola’s gender are revealed, Orsino proposes to Viola.