After Alice Dane, a poor English schoolteacher, witnesses Sir John Turnbull throw an adversary over a cliff, Turnbull offers her money and marriage, because a wife cannot testify against her husband. To support her invalid father and for desired luxuries, Alice accepts, but she finds her husband humiliating and insulting. When Bobby Ralston, the superintendent of Turnbull's South African mines, reports that Turnbull's interests are endangered by a Zulu uprising, Turnbull takes Alice to Africa. After Turnbull shoots an emissary of Zulu chief Cetygoola carrying a flag of truce, Alice is taken hostage, to be burned at the stake unless the messenger's killer is offered. Knowing that Ralston loves Alice, Turnbull dares him to offer himself, which he does, but the Zulus realize he is not the guilty party. During the Zulus' subsequent attack, Ralston and Alice escape to an observation balloon. Reinforcements defeat the Zulus, but Cetygoola hides and kills Turnbull. Ralston and Alice are then free to marry.