A man lives in total solitude in an abandoned mountain village. But each night, at the same hour, a mysterious distant light appears on the far side of the valley and disturbs his isolation. What is it? Someone in another deserted village? A forgotten street lamp? An alien being? Eventually, the man is driven to discover its source. He finds a young boy who also lives alone, in a house in the middle of the forest. But who really is this child? The answer at the secret heart of this novel is both uncanny and profoundly touching.