Tot oder lebendig 1987 one on netflix

A moderately successful detective with the state police takes in his twin sister’s child, a 14-year-old boy who has never been sent to school, does not speak, but seems to possess unusual abilities. A strange bond develops between the two, which takes on irrational traits when it becomes clear that the boy has something to do with strange deaths and can apparently “conjure” the soul out of bodies.