A ship is wrecked on the rocks. Viola is washed ashore but her twin brother Sebastian is lost. Determined to survive on her own, she steps out to explore a new land. So begins a whirlwind of mistaken identity and unrequited love. The nearby households of Olivia and Orsino are overrun with passion. Even Olivia's upright housekeeper Malvolia is swept up in the madness. Where music is the food of love, and nobody is quite what they seem, anything proves possible.

作为莎士比亚最受欢迎的浪漫喜剧之一，《第十二夜》讲述了双胞胎兄妹塞巴斯蒂安和薇奥拉在一次航海事故中失散，薇奥拉以为哥哥身遭不幸，便女扮男装，化名西萨里奥，投到当地的奥西诺公爵门下当侍童。奥西诺公爵派薇奥拉替他向年轻貌美而富有的伯爵小姐奥莉维亚求婚。不料奥莉维亚小姐对女扮男装的薇奥拉一见钟情，而薇奥拉却偷偷爱上了公爵……当被海盗船长救起的塞巴斯蒂安也来到伊利里亚，一切姻缘将如何安排？