A scavenger discovers a strange, living artifact in the ruins of a city controlled by a bio-engineered leviathan. Rachel, a scavenger in the ruins of a city once known as the Archipelago, ekes out a living by navigating the dangerous remnants of a world reshaped by the Company and its monstrous creation, the Borne. Her objective is to survive and perhaps find a better existence, but her discovery of a mysterious, sentient organism—the Borne itself—thrusts her into a conflict with the Company and its enigmatic leader, the Magus. The narrative unfolds through Rachel's first-person perspective, detailing her struggle against the oppressive environment and the biological horrors that inhabit it.

Borne is widely recognized for its unique and unsettling atmosphere, often described as a blend of science fiction and surrealism. Critics frequently highlight VanderMeer's intricate world-building and the novel's exploration of complex themes such as identity, consciousness, and the consequences of unchecked scientific ambition. The narrative's unconventional structure and enigmatic nature have led to varied interpretations among readers, with many praising its originality and thought-provoking narrative. The book is often discussed in relation to its predecessor, Annihilation, sharing a similar sense of mystery and ecological dread.