Rex Randolph is hired by a jeweler named Raoul Roulas, to fly to the South American country of San Marco and bring back the murderer of his son. Mr. Roulas believes a swindler named Duke Powell killed his son, stole some jewelry, and fled to San Marco where he bought a gambling nightclub. Mr. Roulas' daughter, Amanda, followed Duke to San Marco to get revenge for killing her brother, and takes a job incognito singing in Duke's nightclub until she can get her revenge. Mr. Roulas also wants Rex to bring Amanda home safe and sound . Upon his arrival in San Marco, Rex discovers the facts of the case are quite different.
—Clintessence