Here is YOUR screenplay concept for the day. I’m giving you the basic premise (below) and will help you (upon request) to help turn these pages on the screen. Good luck this is now YOUR vision.
(1) John is having his 21st party on the top floor of a skyscraper which has sealed doors.
(2) The place is packed with a wild diverse crowd in which most are having the time of their life.
(3) Suddenly electricity is cut throughout the city and it appears that nobody is left in this world except for those at the party.