School killer

This horror movie directed by Carlos Gil follows a group of friends who decide to spend a weekend in a mysterious abandoned building. Twenty seven years before, another group put on a party in this same building. Closed due to bad conditions, this school was the one they went: the Monte Alto. The keeper of the building went crazy and started to kill them all, one by one. This psychopath disappeared and now, all these years later, he seems to be back to terrorize the main characters of the movie. This new group of friends do not know what happened. Except one of them, who knows everything. Together, they will have to face a new killing spree before it is too late and neither of them goes out of there alive.