Someone at Oxford's Foreign Examination Syndicate is selling exam secrets. Nicholas Quinn, a member of the board, overhears something he shouldn't know about and is soon found dead at his cottage, poisoned with cyanide - but Nicholas was deaf. Then crossword compiler Philip Ogleby has his skull smashed in. During his investigations, Morse is attracted to Monica Height. She works for the Syndicate and may be mixed up in the corruption which led to Quinn's murder, and perhaps to Ogleby's as well.

Morse investigates murder on hallowed ground. A quiet country church is an unlikely setting for the killing, and a vicar and his voluntary helpers are the unlikely suspects. Among them is Ruth Rawlinson, whom Morse is attracted to. Then it appears that a serial killer is at work.

Laura Poindexter, a rich American tourist, dies in the Randolph Hotel, Oxford, apparently from a heart attack, but Morse suspects foul play. Laura was due to return a historic jewel to an Oxford museum, and it has gone missing. Then Dr Kemp, who is a womanizing historian, dies of a fall, Lucy Downes is crushed to death in a telephone box, and Dr Kemp's widow appears to take a fatal overdose of Paracetomol.Morse believes the deaths are all linked.

Morse investigates the reported theft of erotic paintings belonging to Sir Julius Hanbury, a local baronet who is one of those standing for election as the new Master of Courtney College, Oxford. As well as the pictures, Sir Julius himself has also disappeared. Morse finds Sir Julius's dead body, and at first it looks like murder, but the new police pathologist, Dr Grayling Russell, believes he killed himself. Then there is another death which is undoubtedly a murder - but how is it connected with the late Sir Julius Hanbury?

Morse finds himself at the top of the suspect list when his lady friend, Beryl Newsome, is stabbed at a dress rehearsal for the local amateur dramatic society's production of The Magic Flute. Then Lewis starts uncovering more incriminating evidence, and Morse becomes the target of direct attacks. Who is it that wants to get at Morse so badly?

The search for a retired 'supergrass' takes Morse and Lewis from Oxford to the Australian outback. Strangely, Lewis is less at home down under than Morse himself is.

A new drug developed to combat senility is ironically being distributed to teens at all-night parties and driving some to suicide.

A nasty but very rich businessman and a world-famous opera singer are in Oxford to receive honorary degrees from the Chancellor of the University. However, the ceremony has to be abandoned when a sniper opens fire on the procession of dignitaries. The singer is seriously wounded, but was she the intended target?

An Oxford professor and fund raiser is stabbed to death at home with a weapon that is yet to be stolen from a university museum.

When the next-door neighbour of a murdered woman is also killed, Morse suspects the first shooting may have been an error.