The Mystery of Betty Bonn

The Mystery of Betty Bonn (Das Geheimnis um Betty Bonn) is a 1938 German adventure film directed by Robert A. Stemmle and starring Maria Andergast, Theodor Loos and Hans Nielsen. The film was shot at the Babelsberg Studios in Berlin with sets designed by the art directors Wilhelm Depenau and Ludwig Reiber. It was made by the leading German company UFA, based on a novel by Friedrich Lindemann.

Synopsis
A British attorney working on a small island wants to return home to London, but first has to solve a mysterious crime.