After serving a prison sentence for no fault of her own, café violinist Helene seeks out her twin sister Betty, a famous revue star in Vienna engaged to a public prosecutor. During a sailing trip, Betty accidentally drowns. Helene, at first involuntarily, then consciously, assumes her sister’s identity. Blackmail by two criminals soon follows.
| Actor | Role |
|---|---|
 Luise UllrichBetty Gall, Revuestar + Helene Gall, Kaffeehausgeigerin | Betty Gall, Revuestar + Helene Gall, Kaffeehausgeigerin |
 Gustav DiesslDr. Hans Hellwig, Staatsanwalt | Dr. Hans Hellwig, Staatsanwalt |
 Lucie HöflichAnna, Wirtschafterin bei Betty Gall | Anna, Wirtschafterin bei Betty Gall |
 Oskar SimaSemmelweich, Verbrecher | Semmelweich, Verbrecher |
 Anton PointnerBrillanten-Emil, Verbrecher | Brillanten-Emil, Verbrecher |
 Tibor von HalmayBaron Hayduk | Baron Hayduk |
 Rudolf CarlWaraschitz, Inspizient | Waraschitz, Inspizient |
| GGretl BerndAnita Roller, Schauspielerin | Anita Roller, Schauspielerin |
| AAlbert HeineGefängnisdirektor | Gefängnisdirektor |
| RRichard WaldemarJanos, Bootswärter | Janos, Bootswärter |
| MMihail XanthoUntersuchungsrichter | Untersuchungsrichter |
| RRobert ValbergArzt | Arzt |
| MMizi GrieblGarderobenfrau | Garderobenfrau |
| OOskar PouchéNot listed | Not listed |
| EErnst PröcklNot listed | Not listed |
| EElse PircherNot listed | Not listed |
| HHella KolniakNot listed | Not listed |