While building a pipeline near the Okavango Delta, a contractor unearths the remains of a long-dead Bushman. Rookie Detective David 'Kubu' Bengu of Botswana CID and Scottish pathologist, Ian MacGregor, are sent to investigate, and MacGregor discovers the skeletons of eight more men. Shortly after the gruesome discoveries, the elder of a nearby village is murdered in his home. The local police are convinced it was a robbery, but Kubu isn't so sure...and neither is the strange woman who claims that an angry river spirit caused the elder's death. As accusations of corruption are levelled and international outrage builds over the massacre of the Bushman families, Kubu and his colleagues uncover a deadly covenant, and begin to fear that their own lives may be in mortal danger. . .