While Alonso continues to mourn the loss of his son, Prospero relates that he too has lost his child, his daughter. But he means that he has lost her in marriage and pulls back a curtain to reveal Ferdinand and Miranda playing chess. Ferdinand explains to his father that he is betrothed to Miranda and that this event occurred while he thought his father dead. Alonso quickly welcomes Miranda and says he will be a second father to his son's affianced. At the sight of the couple, Gonzalo begins to cry and thanks God for having worked such a miracle.
Ariel enters with the master of the boat and boatswain. Although the ship lay in harbor and in perfect shape, the puzzled men cannot explain how any of this has occurred. Alonso is also mystified, but Prospero tells him not to trouble his mind with such concerns. Next, Ariel leads in Caliban, Stefano, and Trinculo, who are still drunk. Prospero explains that these men have robbed him and plotted to murder him. Caliban immediately repents and promises to seek grace. The three conspirators, who have sobered somewhat since confronted with Prospero and the king, are sent to decorate Prospero's cell. Prospero invites his guests to spend the night with him, where he will tell them of his adventures and of his life during these past 12 years. Ariel's last duty to Prospero is to provide calm seas when they sail the next morning.
