In Capetown, South Africa, in September 1966, Prime Minister Hendrik Verwoerd, the architect of apartheid, was stabbed to death in Parliament. The course of South African history was changed by the assassin, Dimitri Tsafendas, who was written off as mad and condemned to twenty-eight years of imprisonment. A Question of Madness tells the extraordinary human story of a man, born of a black mother, but classified white, who travelled the world in hopeless search of sanctuary - eventually returning to the land of apartheid to wreak vengeance on the one who symbolized the racism which had haunted his life.

• Documentary