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.