This novel, written in the late 19th century by H. Rider Haggard, follows the life of Dr. James Therne as he faces a moral and professional crisis shaped by debates over vaccination and public health. As he reflects on his past, he recalls the devastating smallpox epidemic in Dunchester and struggles with the guilt of its consequences. The loss connected to his daughter Jane deepens his emotional burden and intensifies his inner conflict. His journey to Mexico introduces external dangers, including attacks by brigands, adding tension to his already troubled state. Through these experiences, the narrative explores the weight of responsibility and the moral implications of his choices.