Hardy is asked to do a further post mortem by the defence in the second appeal of a man convicted of the murder of his wife. The first post mortem was done by an old colleague and Hardy's findings conflict, straining their friendship. Guest stars Paul Chapman, Richard Hurndall, Noel Johnson, Peter Forbes-Robertson and Philip Ryan.

An Arab ruler suddenly dies in London and Hardy is caught up in a situation of political intrigue. Guest stars Peter Arne, Damien Thomas, Edgar Wreford, Frank Mills and Michael Bangerter.

Motive, opportunity, possession of the weapon and an alibi that won't stand up. Who wants more to prove guilt of murder? Hardy involves himself in a case that affects one of his oldest friends. Guest stars Nigel Stock, John Rolfe, John Harvey and John Hamill.

When a headless skeleton is found the bones indicate one solution and the remnants of clothing another. Guest stars Frederick Hall, Richard Beale, Max Faulkner and Jay Neill.

An elaborate plan goes wrong because of a woman's intuition. Guest stars Lisa Harrow, Jeremy Clyde, Terence Longdon, Philip Madoc, Elizabeth Spriggs, Edmund Pegge and George Ballantine.

Many things can go awry when the law is exercised by the wrong people. Guest stars John Bowe, Veronica Strong, Nigel Lambert, Norman Henry and Martin Neil.

The police and Hardy are greatly puzzled by the death of a mortuary attendant. Guest stars Warren Clarke, Tim Woodward, Michael Feast, Norma West and Frederick Schiller.

Did evidence Hardy gave in a murder trial 13 years ago result in a miscarriage of justice? Hardy feels that he must pursue the truth of the case, no matter the personal cost. Guest stars Edward de Souza, Tim Barlow, John Woodnutt, Michael Troughton, William Wilde, Nancie Jackson and John Forgeham.

A spell is cast which results in a death at 'The Hour of the Snake'. Is it murder – or what? Guest stars Elizabeth Adare, Tom Chadbon, Clifton Jones, Michael Sheard, Nicholas Donnelly, Oscar James and Peter Tuddenham.

One can legislate for most things – but how do you cope with human frailty and greed? In the very last episode of the series, Professor Hardy is unwillingly pulled into a case that, while it makes him very uncomfortable, dictates that he must follow his strict code of ensuring scientific honesty, whatever the outcome. Guest stars Richard Griffiths, Milton Johns, Hugh Manning and Nigel Humphreys.