Police battle against a gang of blackmailers known as The Crimson Circle.
Lya Mara
Thalia Drummond
Fred Louis Lerch
Jack Birdmore
Stewart Rome
Derrick Yale
Albert Steinrück
Froyant
John Castle
Inspektor Parr
Otto Wallburg
Marl
Hans Albers
Diener von Marl
Hans Marlow
Birdmore
Otto Treßler
Ministerpräsident
Ilka Grüning
Eine Vermieterin
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