When a portrait painter in his thirties is abruptly abandoned by his wife, he withdraws from his life in Tokyo and takes refuge in a secluded mountain home once owned by a celebrated artist, Tomohiko Amada. Living in isolation, he resumes painting and drifts through his days—until a hidden painting discovered in the attic sets off a chain of events he cannot fully explain.

Soon, subtle disturbances begin to ripple through his quiet surroundings: the sound of a bell in the night, the appearance of a strange, diminutive figure who embodies an abstract “Idea,” and the growing presence of a wealthy, enigmatic neighbor across the valley. As he becomes entangled with these forces—and with a perceptive young girl who enters his life—the boundaries between reality, memory, and imagination begin to blur.

What unfolds draws him into a deeper, symbolic landscape tied to art, history, and the unseen structures beneath the world, including echoes of wartime Europe and hidden spaces beneath the surface of the present. Killing Commendatore is a richly layered novel about loneliness, creativity, and the search for meaning, where the act of painting becomes a way of navigating both the visible and the hidden dimensions of existence.