The narrator recounts being rescued after a shipwreck and taken to a remote island where a controversial medical experimenter performs surgical procedures to convert animals into humanlike beings. The story follows the narrator's encounters with these hybrids, the caretaker who enforces a codified set of rules, and the ethical and existential tensions that arise as animal instincts resurface. Gradually the fragile social order collapses into violence, forcing confrontations about identity, suffering, and the limits of scientific authority, while the narrator struggles to reconcile horror, compassion, and survival.