This unusual trial centres on an alleged assault in the courtroom at the end of another case. Harold Phillips is accused of striking his wife at the close of a trial where her new partner, barrister Jeremy Halstead, had been prosecuting. The prosecution he struck her in anger. Phillips does not deny that he was annoyed at the break-up of his marriage and that he wanted to speak to Halstead. However he insists his wife ran towards him and collided with him by accident. The defendant decides to take over from his own counsel and the case reveals a tale of open relationships and "wife-swapping" parties.