To All a Goodnight

During Christmas vacation two years earlier, a student is killed when accidentally pushed over a balcony during a prank at Calvin Finishing School For Girls. The accident is hushed up, leaving a haunting memory that fuels Mrs Jensen's later vendetta.

On the Friday before Christmas, Nancy, Melody, Leia, Trisha and Sam decide to stay behind for a weekend with their boyfriends. During dinner, their classmate Cynthia and her boyfriend are murdered outside the school by a masked assailant in a Santa disguise.

The girls coerce Nancy to slip sedatives into Mrs Jensen's milk, making the housemother fall asleep. The aim is to keep Mrs Jensen out of the way while the weekend unfolds.

The remaining girls meet their boyfriends at the airstrip, reuniting with the private plane travelers as a tense mood settles over the house. The night carries an ominous sense that danger is near.

Trisha goes to the kitchen to retrieve beer and is confronted by the Santa killer who slits her throat. The others realize something is terribly wrong as the ominous killer closes in on the house.

Tom goes to find Trisha, only to be chased outside by the killer who smashes his head with a rock. The killer then buries Tom's body in the garden, joining the earlier victim in the earth.

In the parlor, Sam and Blake share a moment, but the killer in armor shoots Blake with a crossbow and decapitates Sam with an axe. The rampage makes the danger inside the house unmistakably real.

Nancy encounters Ralph, the groundskeeper, who ominously warns that something evil is about to happen. Meanwhile Melody seduces Alex in his room as the night pulses with fear and desire.

The next morning, Nancy finds Ralph's corpse in the woods. Detective Polansky arrives to investigate and hints that the missing could be victims or possibly perpetrators, deepening the mystery.

That night, Jim, a police officer stationed outside, is murdered with an axe. Inside, Leia seduces Dan before heading to the bathroom, where she discovers Sam's severed head and Dan is stabbed as he enters.

Nancy and Alex encounter Leia, who has suffered a psychotic break and now dances and hums on the balcony, unable to speak as the danger closes in around them.

The killer is revealed to be Mrs Jensen, seeking revenge for her daughter's death. Polansky is revealed to be her husband. Melody and T. J. are killed at the airstrip when the Santa costume starts the plane, slicing them with the propeller.

Alex shoots Polansky with a crossbow as Nancy and Alex flee the school together, leaving Leia behind, dancing on the balcony in a macabre farewell.