What information does SparkNotes offer about "Oedipus the King"?

Oedipus steps out of the royal palace of Thebes and is greeted by a procession of priests, who are in turn surrounded by the impoverished and sorrowful citizens of Thebes. The citizens carry branches wrapped in wool, which they offer to the gods as gifts. Thebes has been struck by a plague, the citizens are dying, and no one knows how to put an end to it. Oedipus asks a priest why the citizens have gathered around the palace. The priest responds that the city is dying and asks the king to save Thebes. Oedipus replies that he sees and understands the terrible fate of Thebes, and that no one is more sorrowful than he. He has sent Creon, his brother-in-law and fellow ruler, to the Delphic oracle to find out how to stop the plague. Just then, Creon arrives, and Oedipus asks what the oracle has said. Creon asks Oedipus if he wants to hear the news in private, but Oedipus insists that all the citizens hear. Creon then tells what he has learned from the god Apollo, who spoke through the oracle: the murderer of Laius, who ruled Thebes before Oedipus, is in Thebes. He must be driven out in order for the plague to end.