When Tim Trevor buys a mysterious belt from an antique shop in London, he doesn’t know that it will take him into the secret caves of the Amalek tribe in Sibiloi, Northern Kenya. Biologist Dr Martha Watkins breathes and lives to unravel the origin of humanity. When she learns that the little-known Amalek will answer humanity’s biggest question in Sibiloi, she joins Trevor and archaeologists Dr Paul Brando from California, US, and Professor Simiyu from Kenya for an archaeological expedition in Kenya. Deep in the caves of Sibiloi in Turkana, Kenya, is the answer that has evaded researchers for ages: they found details of human DNA on a cave wall left by beings from antiquity. But some forces do not want the truth to come out: Sibiloi holds secrets of the genesis of humanity.