In a small town at the end of World War II: The Gestapo wants to kill off all five thousand inmates in the local insane asylum but for the time being, their plans are put on hold. One of their chiefs, a former gym teacher, has to interview the patients in order to find out which one is an English spy. So he tells the director that he will pose as a doctor and talk to all the patients in turn. What ensues are several ludicrous exchanges as the Gestapo chief of questionable sanity himself talks to five different, supposedly insane patients.