Denis Goldberg was the only white anti-apartheid activist to be convicted at the 1964 trial in which Nelson Mandela and his comrades were sentenced to life imprisonment. The film opens with Denis returning for the first time to the cell at Pretoria Prison, where he was incarcerated for 22 years.He describes his journey into the shadowy world of underground resistance against apartheid, his dramatic arrest, prison and finally his controversial release, to observe apartheid's collapse from exile.