Der Mörder und sein Kind (1995)

On the outside, Martin Dreyer looks like the nice neighbor next door. He lovingly looks after his paralyzed brother and his friends have never noticed him in a negative way. Nobody sees what a monster lies dormant inside him. No one suspects the incomprehensible. Martin suffers from a terrible burden: an obsessive desire for young girls. When Martin meets the young, petite Sonja one day and falls in love with her straight away, he believes in a new life. He asks her to marry him. She is surprised at his quick decision, but then agrees. What Martin doesn't know until then is that Sonja has a little daughter.