Madness Rules (German: Matto regiert) is a 1947 Swiss crime film directed by Leopold Lindtberg and starring Heinrich Gretler, Heinz Woester and Elisabeth Müller.

Lead actor Gretler reprised his role of the policeman Jakob Studer from the 1939 film Constable Studer, also adapted from a Glauser novel.

The film was shot between December 1946 and March 1947 at the Bellerive and Rosenhof Studios in Zürich with some location shooting around Königsfelden.

The police investigate the murder of the head of a mental hospital who had recently been in dispute with his colleague over their treatment of a young patient.

You can help Wikipedia by expanding it.This 1940s crime film-related article is a stub.