Ellen suffers from recurring nightmares about a demonic looking man clad in black, who wants her dead, whom she refers to as The Nightmare Man. Things get so bad that her loving husband William has her committed. On the way to the hospital the car runs out of gas and Ellen is left alone whilst William goes to a garage. Ellen is inevitably attacked by the titular stalker and escapes to an isolated log cabin where two young couples are having a weekend of drinking and debauchery. With only Ellen having seen The Nightmare Man, the 'twentysomethings' must decide if Ellen has imagined her ordeal or if someone really is outside waiting to kill them.