A new internet challenge called ''creeping'' is sweeping across social media. ''Creeping'' is a dangerous online trend that dares participants to spend the night at a frightening location - from crumbling cemeteries to derelict morgues. As more people join in, the competition increases - who can outdo the latest scary destination? One group of thrillseekers determines to find the most terrifying place in the world - an abandoned medieval fortress-turned-insane asylum fills the bill, but they soon realize they are in for more than they bargained for.