A knock at the door in the dead of night when no one is expected is definitely something that can bring chills down one's spine. Sooner or later, Rose, an unsuspecting young brunette home alone, will discover that three knocks on the door--or any other part of the house--are far worse than a single one; moreover, unanticipated presents at the doorstep are best left unopened. This night, the mystical number three is predominant. Three knocks at the door, three ordinary objects, three more minutes to stay alive.