Two best friends from Berlin win a trip to Greece. On their excursion, they get lost on an island. They spend the night together in a cave and dream a mystical dream. On the next day, nothing between the two will be like it was before.

An international group of film students finds a disturbing video clip on the dark web which seems to contain poltergeist phenomena. Agreed that it's just what they need for their latest documentary project the group travels to the sanatorium shown in the video clip. Once there, they rig up their camera equipment and start to explore the possible ghost activities - until the true horror begins.