This gripping novel by H. Rider Haggard tackles the controversial issue of vaccination through the story of Dr. Therne, a physician who faces a moral and scientific dilemma. Set in the late 19th century, the tale explores themes of fear, public health, and the consequences of unethical decisions. As an anti-vaccination advocate, Dr. Therne’s choices lead to a public health crisis, forcing him to confront the devastating impact of his beliefs.