A doctor who cannot figure out what is wrong with his patient refers him to a detective, whom he hopes will be able to discern the cause of his mysterious illness.
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Max Landa
Detective Landa
Reinhold Schünzel
Freiherr von Mohrungen
Conrad Veidt
Wilmos, sanatorium director
Hilde Woerner
Siegnis, maid
MvK
Marga von Kierska
Frau von Riberac
