The Prince of Guastalla falls in love with the young citizen Emilia Galotti, who is soon to marry Count Appiani. In order to win Emilia, the prince tries to send the count on an "honorable" journey on his behalf with the help of his chamberlain Marinelli. However, after the Count refuses this offer, Marinelli decides to have the wedding carriage robbed on his own initiative in order to have Emilia abducted to the Prince's nearby pleasure palace. But he has not thought of the prince's mistress, Countess Orsina, and Emilia's shaken father Odoardo, both of whom soon arrive at the castle, one to meet the prince, the other to look after his daughter...