Italian partisans help a professor sent by the OSS to find an atomic scientist held by Nazis.
| Actor | Role |
|---|---|
 Gary CooperProf. Alvah Jesper | Prof. Alvah Jesper |
 Lilli PalmerGina | Gina |
 Robert AldaPinkie | Pinkie |
 Vladimir SokoloffPolda | Polda |
 J. Edward BrombergTrenk | Trenk |
 Marjorie HoshelleAnn Dawson | Ann Dawson |
 Ludwig StösselThe German | The German |
 Helene ThimigKaterin Lodor | Katerin Lodor |
| DDan SeymourMarsoli | Marsoli |
 Marc LawrenceLuigi | Luigi |
 James FlavinCol. Walsh | Col. Walsh |
 Patrick O'MooreThe Englishman | The Englishman |
| CCharles MarshErich | Erich |
 Yola d'AvrilFirst Nurse | First Nurse |
 Lex BarkerNot listed | Not listed |
 Robert CooteCronin | Cronin |
| HHella CrossleyNot listed | Not listed |
 Elvira CurciNot listed | Not listed |
 Claire Du BreyNot listed | Not listed |
 Gil PerkinsNot listed | Not listed |
 Lotte SteinNurse | Nurse |
| VVictor ZimmermanNot listed | Not listed |
| DDan SheridanBritish Adjutant | British Adjutant |