Ellen believes there is a supernatural creature trying to kill her named the "Nightmare Man".

When her husband goes to get gas, Ellen stays behind and is attacked by the mysterious, horrifying enemy, the Nightmare Man.

Escaping into the nearby woods, Ellen stumbles upon a country house where two young couples are spending the weekend.

Ellen reveals she is possessed by the real Nightmare Man, a demon who enters a female body first by getting them to wear his mask, then he rapes them.

She sets her sights on Mia, the survivor, who kills Ellen, but is stripped and raped by the Nightmare Man's spirit.