A writer who studies the paranormal believes that low frequency tactile sound is the cause for reported ghost sightings in an abandoned subway station. In an attempt to debunk the sightings, she breaks into the station to record evidence.
九岁的小男孩米歇尔（乔瑟培·克里斯提亚诺 Giuseppe Cristiano饰）一日在玩耍的时候，无意间发现了地穴里的一个秘密。他惊讶的发现在这口地穴中囚禁着一个与他年纪相仿的金发男孩菲利普（马悌亚·狄·皮耶 Mattia Di Pierro饰），他被铁铐牢牢地锁着，弱小而无助。被震惊了的米歇尔立刻逃回家中，然而在好奇心的驱使下，他又一次前往地穴。他们…
