? (Question-mark) 2016 one on netflix

In a small remote town up in the mountains, the society is shocked by a triple homicide of extreme nature, performed by a 20 year old boy. With the murderer seemingly brainwashed and has no memory of the event, the local police believes a local cult is behind it. Bernard a 60 year old Austrian man working with the police as a medium is put on the case to solve the mystery of the old rotten skull found in the murderers car.