Leonard Shelby is tracking down the man who raped and murdered his wife. The difficulty of locating his wife's killer, however, is compounded by the fact that he suffers from a rare, untreatable form of short-term memory loss. Although he can recall details of life before his accident, Leonard cannot remember what happened fifteen minutes ago, where he's going, or why.
This is the story of an isolated Alaskan town that is plunged into darkness for a month each year when the sun sinks below the horizon. As the last rays of light fade, the town is attacked by a bloodthirsty gang of vampires bent on an uninterrupted orgy of destruction. Only the small town's husband-and-wife Sheriff team stand between the survivors and certain destruction.