The village of Seefeld (Tyrol) has just been the scene of a tragedy: Wollmer, owner of the sawmill and of most of the country, a hard and rapacious man, has just been assassinated. Everyone hated him and Friedrich, the commissioner in charge of the investigation, will have to work hard to find the culprit. Arrives Wollmer's widow, who was going through a divorce. A foreman, Franz, offers to help him. But she receives anonymous letters offering her the name of the murderer for money. Franz has strange reactions, and so does Klara, the hotelier's daughter, who takes a dim view of his intimacy with Mrs. Wollmer. Harassed by the sound of a typewriter, Mrs. Wollmer gradually loses control of her nerves. She accuses Franz and, in a movement of hatred, throws him into a ravine. Yet the typewriter continues to persecute her. When she finally discovers the author of the letters, the policeman arrives, preventing another time from striking the criminal hand which was none other than that of Mrs