What is the primary tribe in Zimbabwe in the novel, The Ear, the Eye and the Arm?

The spirit world of the primary tribe in Zimbabwe, the Shona, reflects a polytheistic belief in animism. The highest power in this spiritual realm is called Mwari and is a symbol for the natural order of the universe. Disturbances in the natural order cause evil that must be redressed by consultation with Mwari. Mhondoro is the lion spirit who stands as guardian over the earth and its peoples. The mhondoro brings fair weather or foul, feast or famine. The family god is mudzimu, who cures diseases and heals arguments. Sometimes mudzima takes an interest in a particular descendant and teaches that person a special skill. The angry, vengeful spirit who can cause madness is known as ngori. Unresolved issues from life must be settled before ngori will leave. A shave is the restless spirit of someone who dies far from home and thus didn't receive a proper burial ceremony.