A group of teenagers must somehow survive the night when they find themselves trapped within a pentagram. To stay inside the candlelit confines means safety; to escape means certain death at the hands of a mysterious entity.

In a staid English seaside town after the Second World War, young Lynda grows up with her widowed father and younger sister. She eventually becomes pregnant by an acquaintance of her father.

When a psycho goes on a murderous rampage after surviving a botched execution, only two survivors of his initial attack can stop him.