After a violent storm, a dense cloud of mist envelops a small Maine town, trapping artist David Drayton and his five-year-old son in a local grocery store with other people. They soon discover that the mist conceals deadly horrors that threaten their lives, and worse, their sanity.

When a group of tourists on a New Orleans haunted swamp tour find themselves stranded in the wilderness, their evening of fun and spooks turns into a horrific nightmare.

黃昏時分，全身赤裸的男子在的商店街離奇死亡，而在他的屍體上更驗出神秘的寄生蟲──。這種寄生蟲擁有超強感染力，令人們陷入恐慌。究竟這是誰幹的事…！？ 兩位刑警追查這件怪事，在「神秘療養院」竟然見到…！？