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Constable Studer is a 1939 Swiss crime film directed by Leopold Lindtberg and starring Heinrich Gretler, Adolf Manz and Anne-Marie Blanc. The film is based on a novel by Friedrich Glauser. It was followed by a sequel Madness Rules in 1947 with Gretler reprising his role. It was shot at the Rosenhof Studios in Zürich over the summer of 1939. Wikipedia