某座城市的验尸房，艾米（丹妮尔·哈丽丝 饰）行色匆匆，准备参加亲朋为她准备的生日派对。而就在此时，惨无人道的大屠杀在城中另一个角落发生，九人遇害，而屠戮他们的凶手雅克布

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.