Set in a dystopian future, the novel explores a society where human beings are genetically bred and pharmaceutically conditioned to serve in a ruling order. The society is divided into five castes, each with its specific roles. The narrative follows a savage who rejects the norms of this new world order and struggles to navigate the clash between the values of his upbringing and the reality of this technologically advanced, emotionless society. His resistance prompts a deep examination of the nature of freedom, individuality, and happiness.

In this science fiction novel, a Jesuit priest and biologist, part of a four-man scientific commission, grapples with a moral dilemma after studying the inhabitants of the planet Lithia. The Lithians are an advanced, peaceful reptilian species living in an apparent utopia without any concept of religion or God. The priest's crisis deepens as he questions whether the Lithians' society is inherently evil, a creation of Satan designed to challenge faith, or if it can coexist with human and Christian values. His quandary is compounded when he is given a Lithian egg to take back to Earth, which hatches into a creature that could influence the future of humanity and challenge the very foundations of his beliefs.

In this science fiction narrative, the story revolves around an engineer who is assigned to a space station where genetically engineered humans, designed with four arms and no legs for zero-gravity work, are being bred by a corporation for economic gain. When the company decides to abandon the project, viewing these beings, known as "quaddies," as obsolete and a liability, the engineer faces a moral dilemma. He must choose between his own safety and career or the welfare of the quaddies. Ultimately, he decides to rebel against the corporation, leading a daring escape plan to save the quaddies from being decommissioned and to find them a new home where they can live free.