The young doctor Dr. Virginia Larsen fights in vain against malaria on an island in the Antilles. She finally receives support from Dr. Dos Passos. The doctor persuades the rebellious natives to get vaccinated. They even help to dispel the suspicion of murder weighing on Dos Passos.
| Actor | Role |
|---|---|
 Sybille SchmitzDr. Virginia Larsen | Dr. Virginia Larsen |
 Albrecht SchoenhalsDr. Dos Passos | Dr. Dos Passos |
 Fritz OdemarProf. Freemann | Prof. Freemann |
 Rudolf FernauNot listed | Not listed |
 Hermann SpeelmansWill Rubber Journalist | Will Rubber Journalist |
 Klaus PohlNot listed | Not listed |
 Heinz SalfnerGouverneur Parker | Gouverneur Parker |
 Harry HardtMajor Seegrave | Major Seegrave |
 Lotte SpiraNot listed | Not listed |
 Alexander EngelProf.Forster | Prof.Forster |
| KKarl GüntherKaufmann Sedgewick | Kaufmann Sedgewick |
| KKarl-Heinz PetersDr. Gomes | Dr. Gomes |
 Hanni WeisseNot listed | Not listed |
 Louis BrodyNot listed | Not listed |
| HHermann StetzaNot listed | Not listed |