In the aftermath of the murder of an anonymous victim, assistant superintendent David Bengu begins his career on Botswana, where his convivial passions and determined methods earn him a local nickname that likens him to a hippopotamus.

Faced with the violent death of his own father, Assistant Superintendent David 'Kubu' Bengu, the smartest detective in the Botswana police, is baffled. Who would kill such a frail old man? Kubu's frustration grows as his boss, Director Mabaku, bans him from being involved in the investigation. The picture becomes even murkier with the apparent suicide of a government official. Are Chinese mine-owners involved? And what role does the US Embassy have...

"While building a pipeline near the Okavango Delta, a contractor unearths the skeleton of a long-dead Bushman. Kubu and Scottish pathologist, Ian MacGregor, are sent to investigate, and MacGregor discovers eight more skeletons. Then an elder of the nearby village is murdered at his home. The local police believe it was a robbery, but Kubu thinks otherwise. So does a strange woman who claims it was an angry river spirit. The situation gets more confusing...