Lunatic killer studies every move..

It’s 1981 and the girls of Alpha Gamma Theta sorority are putting on a bash. As the new pledges arrive, so does an uninvited guest – “The Sleeper” – and he’s watching them from the shadows. The girls shower, revise, eat and sleep and all the while the lunatic killer studies their every move. Then they begin receiving creepy phone calls from the madman, always stating which of the girls will be the next to be “put to sleep”. The girls are hunted down one by one by the mysterious foggy eyed killer, using his preferred weapon of choice..... a claw hammer.