After committing a murder for his lover, Gloria, the famous painter Jack is forced to go underground. In the harbor district, he saves the poor Malaysian girl Song in front of two intrusive sailors. She loves him for it, and together Song and Jack appear in the tingle dungeon of the port, he as a knife artist, she as a dancer.
| Actor | Role |
|---|---|
 Anna May WongSong | Song |
 Heinrich GeorgeJack Houben | Jack Houben |
 Mary KidGloria Lee | Gloria Lee |
 Hans Adalbert SchlettowDimitri Alexi | Dimitri Alexi |
 Paul HörbigerSam | Sam |
| JJulius E. HerrmannProprietor Blue Moon Café | Proprietor Blue Moon Café |
| MMax BandelowPress Photographer | Press Photographer |
 Louis BrodyPiano Player | Piano Player |
 Osvaldo ValentiShipboard Romeo | Shipboard Romeo |
 Emmy WydaGloria's Dresser | Gloria's Dresser |