After wandering a ruined city for years in search of food and shelter, two siblings find their way into one of the last remaining buildings. Inside, they find a man who will make them a dangerous offer to survive the outside world.

一只怪物潜伏在一座废弃宅邸的走廊里，专门攻击那些好奇到里面寻找线索的人。两个朋友闯入宅邸，发现所有出口都被封锁了。猎杀他们的怪物越来越渴望他们的鲜血，他们无处可逃……