Stern von Rio (1940)

Concha travels from his hometown in Rio to Germany to assist his beloved, who has gotten into trouble after discovering diamonds in a mine already claimed by a corporation. One of these diamonds, known as The Star from Rio, stands out thanks to her. Concha's loved one ends up residing at the manager's home, working as a dancer to showcase the diamond at a fashion show. However, things take a turn when the lights suddenly go out.