Human Factor

The year is 8000 B.C. A man wanders across a field of prairie grasses in search of edible berries and roots and wild game to feed his family. As he walks, the tips of the grasses brush against him, releasing seeds. He collects a few of these seeds and brings them back to his camp. Later, he notices that when they fall on earth, they begin to sprout, and a new plant grows.

When Arthur Davis, a junior bachelor in the British secret service's African section, is seen taking a file with him -to meet his girlfriend Cynthia- the brass fears he may be the leak to Moskow, and allows Dr. Percival to terminate the 'risk factor' by poisoning to avoid a scandal. In fact Davis's desk chief, Maurice Castle, is the double agent since the South African communists helped him smuggle out his black lover Sarah M., meanwhile his wife and mother of schoolboy Sam, to force him to cooperate with the Apartheid government. When Cornelius Muller, the South African official who failed to get him in Pretoria's power, visits London for the anti-communist operation Uncle Remus, he points out Castle still is the natural suspect…