They Practice on the Living is a brutal, intelligent horror novel about spaces that learn-and what happens when they learn too well.When a condemned psychiatric annex is reopened as an emergency shelter, twelve people enter a building that feels clean, quiet, and slightly wrong. Within days, apparitions appear-human-shaped distortions that don't haunt, whisper, or warn. They practice. They study posture, fear, and reaction. And they kill-violently, grotesquely, and on the page.Each death teaches the building something new.As bodies fall, the survivors realize the truth isn't folklore or demons or ghosts. The horror is structural. The space itself is learning how to replace the living, refining its methods through blood, panic, and repetition.Only three people survive-and only because they break the assumptions the entities rely on. Together, they piece the truth together from failure, not mythology, uncovering what the apparitions are, why they kill, and how to stop something that cannot be fought.The ending answers everything.No rules.No systems.No unanswered questions. Relentless, disturbing, and deeply original, this is horror that doesn't ask for belief-it teaches itself how to take you apart.