A young newlywed couple find themselves trapped in a network of underground caves. With her husband injured, the new bride is forced to find her way back to the surface in order to save his life. In the process, they discover a terrifying truth about the "underneath", they are not alone. Something evil is hunting them.。在一项政府人口减少计划毒害了数百万人之后,当一名暴虐的官员为了拯救自己的儿子而追捕他时,一名免疫的、隐居的幸存者必须为保卫自己的庇护所和自己的理智而战斗。。