Two years after the end of the Second World War, the remnants of Ukrainian Insurgence Army, called the Bandera's after their former commander Stepan Bandera, are trying to get from Poland through Slovakia to Germany in the West. They resort to sabotages also on Czechoslovak territory, and therefore army and police units are deployed to capture them. Soldiers and policemen are warned about the danger of encountering spies and collaborators of the Bandera's. In the meantime police investigators are arresting catholic clergy for supplying the saboteurs with weapons and false documents. Soldiers are operating in the area of Small Fatra, and it seems there must be someone amongst them who provides the Bandera's with information about planned movements of the army.