Oedipus the King unfolds as a murder mystery, a political thriller, and a psychological whodunit. Throughout this mythic story of patricide and incest, Sophocles emphasizes the irony of a man determined to track down, expose, and punish an assassin, who turns out to be himself.
As the play opens, the citizens of Thebes beg their king, Oedipus, to lift the plague that threatens to destroy the city. Oedipus has already sent his brother-in-law, Creon, to the oracle to learn what to do.
On his return, Creon announces that the oracle instructs them to find the murderer of Laius, the king who ruled Thebes before Oedipus. The discovery and punishment of the murderer will end the plague. At once, Oedipus sets about to solve the murder.
Summoned by the king, the blind prophet Tiresias at first refuses to speak, but finally accuses Oedipus himself of killing Laius. Oedipus mocks and rejects the prophet angrily, ordering him to leave, but not before Tiresias hints darkly of an incestuous marriage and a future of blindness, infamy, and wandering.
Oedipus attempts to gain advice from Jocasta, the queen; she encourages him to ignore prophecies, explaining that a prophet once told her that Laius, her husband, would die at the hands of their son. According to Jocasta, the prophecy did not come true because the baby died, abandoned, and Laius himself was killed by a band of robbers at a crossroads.
