What is the theme in Africans by Sheila Kohler?

Betrayal is a central theme in the book. At the end of the story, John Mazaboko betrays Mkatie's trust by holding her down while her husband beats her. This is far different from the treatment that she has come to expect from John. All of her life, John has proved that he wishes to protect Mkatie. For example, as the narrator notes, he saves Mkatie's life when she is very young. "He was unusually tall, and so strong he was able to catch the ancient armoire when it fell forward and almost crushed my sister as a small child.