The narrative begins in a room filled with powerful and wealthy men, all except for the central figure, Zan Uller, a scientist with a twisted body and profound intellect. These men are desperate for Uller's unique knowledge to combat a catastrophic fungal growth that is consuming the planet, destroying both vegetation and animal life, and spreading over oceans.

As Uller recounts his harsh life story, he reveals the adversity he endured from a young age, including poverty, physical abuse, and professional sabotage. Despite these challenges, he became a preeminent scientist, particularly in the study of parasitic plants. His disdain for humanity grew from being ostracized and mocked by his peers and society, which scorned his early warnings about the dangers of fungi.

When confronted with the opportunity to sell or share his potentially world-saving formula, Uller expresses contempt and vindication. He has no desire to assist the society that brutalized him. The men threaten him with violence to extract the formula, but Uller holds firm, revealing that he has destroyed all physical evidence of the formula, keeping only the memory of it in his mind.

In the climax, Uller frames the moment as his ultimate revenge against a cruel world. He claims that the power to save humanity gives him a god-like status, offering him a chance for grand vengeance—not through withholding the formula, but by demonstrating his superiority over those who once demeaned him. However, instead of capitulating or suffering torture, Uller chooses to end his life, denying the formula to anyone, with a gunshot to the head as the men watch in horror.