While Sergeant John Tyree is home on two weeks leave from Germany, he meets Savannah after he dives into the ocean to retrieve Savannah's purse that had fallen off a pier. John eventually falls in love with Savannah, who promises to write to him until he returns from overseas.
A group of friends seal themselves inside a secluded Cape Cod vacation home after a mysterious orange fog leaks from an old nearby factory. Once trapped, they quickly learn there is no escape.