Morse is passed over for promotion and gets a new working partner in the shape of Lewis, who is not sure what to make of his new boss. Their first case together is a murder, when Anne Staveley, who was Morse's friend in a choral society, is found hanged in her house in the Jericho area of Oxford. The death looks like suicide, but Morse has his own reasons for treating the case as a murder investigation. A parking ticket and Oedipus the King, by Sophocles, come to his assistance.

Morse investigates when the annual match of the Claret's old boys' cricket eleven is brought to an abrupt end by the sudden death of a team member - and it seems that cricket was the last thing on their minds.

The apparently motiveless murder of two young women points to a psychotic killer. Morse's speculations on what they might have in common leads him to a local garage owner, Jeremy Boynton, who knew them both, and who arouses his suspicions and dislike. Convinced that Boynton holds the key to the crime, Morse begins to hound him, despite having no firm evidence. Morse is also faced with the possible oss of his beloved red Mk II Jaguar.