The Tempest: Novel Summary: Act 3, scene 3

The royal entourage wanders around the forest in search of Ferdinand.  They become tired and desolate convinced that the prince has drowned.  They stop for rest when strange shapes appear and bring them a feast.  Prospero watches from beyond as they rejoice at the mystical food.  Antonio and Sebastian decide that they will kill the king that evening when they all slept.  Suddenly, Ariel appears in the form of a harpy.  The spirit makes the food vanish and begins chastising Alonso, his brother, and the current Duke of Milan for their treatment of Prospero.  The three are wracked with guilt at their former treachery and they depart in search of Ferdinand.