A subterranean rumbling resonates in the heart of a forest. Hidden by foliage, a metal grate reveals underground passageways, which lead to the cellars of five houses scattered throughout a great park which is cut off from the outside world by a huge wall with no door. In one of these houses, a group of girls aged between seven and twelve gather around a coffin, whose lid opens to reveal a six-year-old girl. Time passes and the girl gets used to her new life, but she is troubled by many mysteries.