An early German Edgar Wallace Krimi from 1931, later re-made by Rialto. One of the writers is Egon Eis who also happened to be responsible for some of the best of the Rialto productions. Also starring another Wallace veteran, Fritz Rasp, and Hungarian actor Szöke Szakall who had a prominent part in Casablanca. Considered lost until a few years ago. Now it's on YouTube but only in German without English subs.