The entire fourth series of the television drama starring John Thaw as Kavanagh QC, one of the country's leading criminal advocates in London, who has worked his way up from a northern working class background. In 'Memento Mori', Kavanagh, now back at work following his wife's death, agrees to defend family GP Dr Felix Crawley (Tom Courtenay) when he is accused of murdering his wife. In 'Care in the Community', Kavanagh travels to his home town of Bolton to defend a young couple charged with murdering their baby daughter. In 'Briefs Trooping Gaily', Kavanagh faces a challenge when one of his clients openly confesses in court to killing her husband. In 'Bearing Witness', Kavanagh representsa Jehovah's Witness who refuses to give her son a life-saving blood transfusion. In 'Innocency of Life', Kavanagh defends a vicar when one of his female parishioners accuses him of sexual harrassment. But he encounters the woman again, only to find that this time she is the accused, and the crime is of a far more serious nature. In 'Dead Reckoning', Kavanagh prosecutes the entrepreneurial owner of a trawler lost at sea with all its men missing. But the local community are convinced that the boat was sunk by a submarine.