Beholder

When Athanasios ?́?Athan?́? Bakirtzis is invited to a mysterious penthouse soiree, he sneaks off to the bathroom, he hears a slam, followed by a scream. Athan peers outside, only to be pushed back in by a boy his age. The boy gravely tells him not to open the door, then closes Athan in. No one survives the party, except Athan.