 The action takes place in a nameless country occupied by the German army at the time of World War II. In a small village there s an asylum. A squad of German soldiers arrives to take the insane people to a "walk in the forest". Just before they are ready to go to forest to kill the insane people, a Gestapo officer arrives and from his conversation with the doctor we can find out that there s an enemy agent hiding himself in the asylum. Officer Windisch must find the agent from 583 people and on his searches he is slowly starting to feel himself crazy too.