The novel is a satirical science fiction tale that explores the discovery of a species of intelligent giant newts. When humans realise they can exploit these creatures for economic gain, they are enslaved and used for labor and military purposes. The newts ultimately rebel, leading to a global war. The book serves as a critique of various political, economic and ideological systems, including colonialism, capitalism and fascism.

The book explores the concept of "carnism," a term coined by the author to describe the invisible belief system that conditions people to eat certain animals while loving others as pets. It delves into the psychological and cultural mechanisms that sustain this practice, examining how societal norms, language, and traditions shape our perceptions and choices regarding animals. Through a combination of research, personal anecdotes, and philosophical inquiry, the book challenges readers to reconsider their dietary habits and the ethical implications of their food choices.

The book presents a compelling argument for the ethical treatment of animals, challenging traditional views on animal rights and advocating for their liberation from exploitation and suffering. It highlights the moral inconsistencies in how humans treat animals, particularly in industries like factory farming and scientific research, and calls for a reevaluation of the human-animal relationship based on principles of equality and compassion. The work is foundational in the animal rights movement, urging readers to consider the impact of their choices on animal welfare and to adopt more humane practices.