A group of former military elites set out to explore an uncharted abyss, not knowing their worst nightmare is waiting for them deep beneath the ground.
位于香格里拉深山的自然景区，阿秀（郑秀文 饰）和大妹、小妹经营着林海旅馆。她的丈夫小田（李光洁 饰）七年前误入林海，生死不明，但阿秀始终没有放弃寻找的希望。
