During a Halloween evening, the youthful chimney sweep Lubicchi encounters a figure magically formed from refuse. He names him Poupelle, and through this friendship he regains the connection he lost when his father perished under the Inquisitors" cruel rule—an authoritarian body intent on erasing external knowledge and the village"s authentic past. Their freshly forged alliance quickly draws notice, and the looming menace of the Inquisitors along with scorn from some locals threatens to strain their bond. Nevertheless, Poupelle strikes a deep chord in Lubicchi, and together they plot to unveil the hidden truth and dispel the smoky veil that shrouds their town"s horizon, and restore hope to the weary souls who dwell.