 Oedipus, King of Thebes, sends his brother-in-law, Creon, to ask advice of the oracle at Delphi, concerning a plague ravaging Thebes.Creon returns to report that the plague is the result of religious pollution, since the murderer of their former king, Laius, has never been caught.Oedipus vows to find the murderer and curses him for causing the plague.