He's not been neglecting his people - he's already despatched Creon, brother of his wife Jocasta, to ask for the help of the oracle of Apollo at Delphi. By a strange coincidence (not uncommon in the theatre!) Creon appears now, wearing the bayleaf crown of the successful enquirer. What, according to the oracle, is causing the plague?

• A crime committed by Laius, the previous king.Investigate it!
• An undetected murderer. Find him!
• A source of pollution. Root it out!