The night before a local haunted house opens for Halloween, six friends sneak in for a few hours of fun. Soon after entering, they find themselves trapped inside with no way out. Their evening of fun rapidly turns into their worst nightmare as they begin to die and disappear in the most freakish of manners. With every effort to escape blocked, the survivors find themselves being driven deeper into the carnivalesque world of terror. Unable to tell what is real and what is counterfeit, they must trust one another, even if it kills them.

故事发生在一个虚构的神话世界中，哈亚（丹尼·格洛弗 Danny Glover 饰）是业界闻名的猎龙人，他发明了战船，以其骁勇善战的个性著称，然而，只有哈亚自己清楚，自己的内心里究竟隐藏了多少的脆弱和悔恨。
原来，哈亚曾经因为胆怯和恐惧导致妹妹死在了白龙的手中，如今，他收养了名为蕾切尔（索非亚·佩尔纳斯 Sofia Pernas 饰）的女孩。蕾切尔的父亲因为在战斗中逃跑而死在了哈亚的手中，哈亚向蕾切尔隐瞒了事实，谎称她的父亲系被龙杀死。伊斯梅尔（柯里·瑟威尔 Corey Sevier 饰）加入了哈亚的队伍，当他和蕾切尔终于深入白龙的巢穴之时，发现的却是身上插有哈亚的长矛的蕾切尔的父亲的尸体。

二次大战，一位美军上尉杰克Wosick，负责率领一支杂牌军，别号「野猪部队」，专在敌后从事背后突击纳粹的秘密任务。在一位法国外籍兵团上尉协助下，专门暗杀纳粹士兵。