Before the end of the Second World War, a special commando marches into a mental hospital located in a beautiful manor house to eliminate the patients. But the Gestapo has received an anonymous letter saying that an enemy agent is hiding among the madmen. Officer Windisch is tasked with finding a simulant among several hundred mental patients in a matter of days.

Before the end of the Second World War, a special commando marches into a mental hospital located in a beautiful manor house to eliminate the patients. But the Gestapo has received an anonymous letter saying that an enemy agent is hiding among the madmen. Officer Windisch is tasked with finding a simulant among several hundred mental patients in a matter of days.