I can't see for my eyes

Psychologist Martin Stein is visited one day by his girlfriend, whom he hasn't seen for years, and asks him to help her find her 10-year-old son, who has gone missing. Everyone, including the police, is convinced that the boy is dead, but his mother refuses to accept this and is still looking for him. So Martin turns to a friend of his who works in the criminal police. It draws him into an even darker case involving a series of brutal murders of women. He finds himself suddenly between two cases that have one thing in common - nobody saw anything.