In the Heilstätten, a gloomy place near Berlin, a group of Youtubers want to experience the toughest challenge of all time while the world watches them. The history of the sanatoriums is full of horror and brutality and even today reports of paranormal activity at this place persist. Equipped with night vision and thermal cameras, the Youtubers want to follow up on the rumors. They quickly realize that it is better not to try your luck in these frightening halls. But when they want to get out, they realize that it is long too late for that...