An investigation into the greatest scientific fraud in history - Piltdown Man. In 1912, the discovery of a skull and jaw bone of our earliest ancestor in Piltdown, Sussex was announced by one of the most eminent members of the British Museum. This find was regarded as the first incontrovertible proof of man's ape-like ancestry and confirmation of Darwin's evolutionary theory. For more than forty years, Piltdown Man was the accepted face of the earliest Englishman but in 1953, new dating techniques exposed him as a fraud. So who was responsible for the plot that fooled the world? And why did they do it? This film reopens the case with new evidence to examine the main suspects and their motives and questions why such a major forgery was overlooked for so long.