The Stay Awake (1987)

A group of girls at a private school are staying awake to raise money.  The school is deserted except for  the girls and their chaperon who are staying in the gym.  The spirit of a serial killer enters the building and starts murdering whoever he can get his hands on.

It's never clear why the killer is targeting these girls, especially since he was executed in the US.  How did his spirit get to Europe?  Wouldn't it be easier to go after a girls school in the state where he died?

Also someone should have told the special effects team that a gooey, scaly monster with jelly candy eyes is not so spooky.