The time is 1963; the place, Port Elizabeth, South Africa. In their lower middle-class home, Piet Bezuidenhout and his wife Gladys are waiting for friends to arrive for dinner. Piet is an Afrikaner man who hasn't achieved much in life, but has found sustenance and meaning in liberal politics. His wife is a South African of English descent, who, we later learn, has recently returned home from being hospitalized for a nervous breakdown. Visible on the stage (or at least to the protagonists) is Piet's collection of indigenous aloe plants. He is attempting to classify a new aloe that he has just found, but which doesn't appear to fit into any of the listed species.

Their awaited guests are Steve Daniels and his family. Steve, a colored man whom Piet met in his political work, was recently released from jail, where he had served time for "subversive" activities. We learn that Steve has obtained a one-way exit permit; the following week he plans to sail with his family to England. When Steve finally arrives two hours late (and a little worse the wear from drinking), it turns out that his wife and children stayed home. In fact, everyone in the movement, including Steve's wife, believes that Piet (the white man) is an informer.

As the two old friends begin to talk, the conversation becomes painful; they circle cautiously around important personal questions. Was Piet really the informer? What happened to Gladys that caused her nervous breakdown? And, finally, why has Steve decided to give up the political struggle and go into exile?