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If any one man is responsible for the rejuvenation of the postwar Swiss film industry, that man was director Leopard Lindtberg. Matto Regiert (Madness Rules) was co-adapted for the screen by Lindtberg from a novel by Friedrich Stauder. Heinrich Gretler stars as Sergeant Detective Stuber, the hero of several of Stauder's most popular works. This time, Stuber must solve the murder of the director of an insane asylum -- and it's not (surprise, surprise) the most likely suspect, manic-depressive patient Olaf Kubler. For box-office purposes, Matto Regiert stresses a romantic subplot involving Kubler and nurse Elizabeth Muller.